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• PortForwarding to IIS in Linux

  - by Simon

  Hi, I am trying to set up port forwarding on a linux box to a IIS webserver on my internal network. The web server sits on Windows 2003 Server. My linux box has eth0 - Internet connection eth1 - internal subnet (10.10.10.x) eth2 - 2nd internal subnet (129.168.0.x) dhcp interface my webserver is on the eth2 interface (192.168.0.6) I am doing port forwarding for port 80 with no avail. I use the same set of rules to port forward to a different webserver and it works. The webapplication is available on the internal network but not for external users. iptables -t nat -A PREROUTING -p tcp -i eth0 -d $PUBLIC_IP --dport 80 -j DNAT --to 192.168.0.6:80 iptables -A FORWARD -p tcp -i eth0 -o eth2 -d 192.168.0.6 --dport 80 -m state --state NEW -j ACCEPT iptables -A FORWARD -t filter -o eth0 -m state --state NEW,ESTABLISHED,RELATED -j ACCEPT iptables -A FORWARD -t filter -i eth0 -m state --state ESTABLISHED,RELATED -j ACCEPT iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE Any Ideas?

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• Problems with DNS propagation 10 days after a change was made

  - by runlevel6

  The engineering team I work with has been in the process of moving equipment from one datacenter to another. Ten days ago we moved one of our name servers authoritative for our client's domains (ns1.faithhiway.com) and updated its IP address with its respective DNS provider (register.com) to point to the new datacenter. All tests done show that this name server is correctly running at its new location and when queried, returning the correct response for any domains it is responsible for. The problem is that well after 72 hours had gone by we were still seeing more DNS activity at its old IP address than at the new. The good news is that we kept a name server responding on the old IP address for the time being so we are not seeing any issues with the domains our nameserver is responsible for but the goal is to retire that as soon as possible. As you can see from WhatsMyDNS.net, a decent amount of propagation has occurred over the last 10 days since we made this change, but still there are some locations reporting our original IP. Considering that the TTL is only 3600 with the name servers responsible for this domain, it does not make any sense to myself or the other engineers working with me that we are having this issue. Now if I run a DNS check using one of the Register.com DNS servers (direct nameservers for faithhiway.com), I get the following (correct) result: # dig @dns01.gpn.register.com ns1.faithhiway.com A ; <<>> DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5_5.3 <<>> @dns01.gpn.register.com. ns1.faithhiway.com A ; (1 server found) ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 43232 ;; flags: qr aa; QUERY: 1, ANSWER: 1, AUTHORITY: 5, ADDITIONAL: 5 ;; QUESTION SECTION: ;ns1.faithhiway.com. IN A ;; ANSWER SECTION: ns1.faithhiway.com. 3601 IN A 206.127.2.71 ;; AUTHORITY SECTION: faithhiway.com. 3600 IN NS dns01.gpn.register.com. faithhiway.com. 3600 IN NS dns02.gpn.register.com. faithhiway.com. 3600 IN NS dns03.gpn.register.com. faithhiway.com. 3600 IN NS dns04.gpn.register.com. faithhiway.com. 3600 IN NS dns05.gpn.register.com. ;; ADDITIONAL SECTION: dns01.gpn.register.com. 3600 IN A 98.124.192.1 dns02.gpn.register.com. 3600 IN A 98.124.197.1 dns03.gpn.register.com. 3600 IN A 98.124.193.1 dns04.gpn.register.com. 3600 IN A 69.64.145.225 dns05.gpn.register.com. 3600 IN A 98.124.196.1 ;; Query time: 50 msec ;; SERVER: 98.124.192.1#53(98.124.192.1) ;; WHEN: Thu Jan 27 15:16:57 2011 ;; MSG SIZE rcvd: 269 Just as a reference, here are the results when the same query is checked against a variety of Public DNS servers: Google: # dig @8.8.8.8 ns1.faithhiway.com A ; <<>> DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5_5.3 <<>> @8.8.8.8. ns1.faithhiway.com A ; (1 server found) ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 12773 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;ns1.faithhiway.com. IN A ;; ANSWER SECTION: ns1.faithhiway.com. 997 IN A 206.127.2.71 ;; Query time: 29 msec ;; SERVER: 8.8.8.8#53(8.8.8.8) ;; WHEN: Thu Jan 27 15:17:31 2011 ;; MSG SIZE rcvd: 52 Level 3: # dig @4.2.2.1 ns1.faithhiway.com A ; <<>> DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5_5.3 <<>> @4.2.2.1. ns1.faithhiway.com A ; (1 server found) ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 46505 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;ns1.faithhiway.com. IN A ;; ANSWER SECTION: ns1.faithhiway.com. 2623 IN A 206.127.2.71 ;; Query time: 7 msec ;; SERVER: 4.2.2.1#53(4.2.2.1) ;; WHEN: Thu Jan 27 15:18:35 2011 ;; MSG SIZE rcvd: 52 Verizon: # dig @151.197.0.38 ns1.faithhiway.com A ; <<>> DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5_5.3 <<>> @151.197.0.38. ns1.faithhiway.com A ; (1 server found) ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 32658 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;ns1.faithhiway.com. IN A ;; ANSWER SECTION: ns1.faithhiway.com. 3601 IN A 206.127.2.71 ;; Query time: 81 msec ;; SERVER: 151.197.0.38#53(151.197.0.38) ;; WHEN: Thu Jan 27 15:19:15 2011 ;; MSG SIZE rcvd: 52 Cisco: # dig @64.102.255.44 ns1.faithhiway.com A ; <<>> DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5_5.3 <<>> @64.102.255.44. ns1.faithhiway.com A ; (1 server found) ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 39689 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 5, ADDITIONAL: 0 ;; QUESTION SECTION: ;ns1.faithhiway.com. IN A ;; ANSWER SECTION: ns1.faithhiway.com. 3601 IN A 206.127.2.71 ;; AUTHORITY SECTION: faithhiway.com. 3600 IN NS dns01.gpn.register.com. faithhiway.com. 3600 IN NS dns04.gpn.register.com. faithhiway.com. 3600 IN NS dns05.gpn.register.com. faithhiway.com. 3600 IN NS dns02.gpn.register.com. faithhiway.com. 3600 IN NS dns03.gpn.register.com. ;; Query time: 105 msec ;; SERVER: 64.102.255.44#53(64.102.255.44) ;; WHEN: Thu Jan 27 15:20:05 2011 ;; MSG SIZE rcvd: 165 OpenDNS: # dig @208.67.222.222 ns1.faithhiway.com A ; <<>> DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5_5.3 <<>> @208.67.222.222. ns1.faithhiway.com A ; (1 server found) ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 12328 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;ns1.faithhiway.com. IN A ;; ANSWER SECTION: ns1.faithhiway.com. 169507 IN A 207.200.19.162 ;; Query time: 6 msec ;; SERVER: 208.67.222.222#53(208.67.222.222) ;; WHEN: Thu Jan 27 15:19:29 2011 ;; MSG SIZE rcvd: 52 SpeakEasy: # dig @66.93.87.2 ns1.faithhiway.com A ; <<>> DiG 9.3.6-P1-RedHat-9.3.6-4.P1.el5_5.3 <<>> @66.93.87.2. ns1.faithhiway.com A ; (1 server found) ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 9342 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;ns1.faithhiway.com. IN A ;; ANSWER SECTION: ns1.faithhiway.com. 169323 IN A 207.200.19.162 ;; Query time: 69 msec ;; SERVER: 66.93.87.2#53(66.93.87.2) ;; WHEN: Thu Jan 27 15:19:51 2011 ;; MSG SIZE rcvd: 52 As you can see above, the majority of queries are returning the correct result. But a few (OpenDNS and SpeakEasy in the examples above) are still showing the old IP address. Considering the length of time that has gone by, it seems obvious to me that either we have made a mistake and not thoroughly handled the DNS changes on our end (likely) or there is a problem with either the DNS provider for this domain (Register) or with some of the DNS servers out in the wild (rather unlikely). Any advice on how I can proceed with this? UPDATE (January 31, 2011): First of all, I apologize for the length of both the original question and this update. I contemplated removing some of the excess from the original post but just in case this problem and its solution are helpful to someone else in the future I'm just going to leave everything as it is. Anyway, I've been doing some more research into this problem, and have discovered the following interesting occurrence. While running a check on the glue records for faithhiway.com always resolve correctly, if I go and check a client domain (where ns1.faithhiway.com is authoritative), I get a strange response. It looks like the root servers are returning nsX.faithhiway.com as their old IP addresses still (under Additional Section). Because we have a server still there responding to DNS queries, the trace finishes and returns the correct IP addresses as the final step (again, under Additional Section). The example below uses one of the domains that we use that uses ns1.faithhiway.com as its authoritative DNS server. # dig +trace +nosearch +all +norecurse ignitemail.com ; <<>> DiG 9.2.4 <<>> +trace +nosearch +all +norecurse ignitemail.com ;; global options: printcmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 46856 ;; flags: qr ra; QUERY: 1, ANSWER: 13, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;. IN NS ;; ANSWER SECTION: . 7986 IN NS a.root-servers.net. . 7986 IN NS b.root-servers.net. . 7986 IN NS c.root-servers.net. . 7986 IN NS d.root-servers.net. . 7986 IN NS e.root-servers.net. . 7986 IN NS f.root-servers.net. . 7986 IN NS g.root-servers.net. . 7986 IN NS h.root-servers.net. . 7986 IN NS i.root-servers.net. . 7986 IN NS j.root-servers.net. . 7986 IN NS k.root-servers.net. . 7986 IN NS l.root-servers.net. . 7986 IN NS m.root-servers.net. ;; Query time: 39 msec ;; SERVER: 8.8.8.8#53(8.8.8.8) ;; WHEN: Mon Jan 31 09:22:17 2011 ;; MSG SIZE rcvd: 228 ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 16325 ;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 13, ADDITIONAL: 14 ;; QUESTION SECTION: ;ignitemail.com. IN A ;; AUTHORITY SECTION: com. 172800 IN NS h.gtld-servers.net. com. 172800 IN NS m.gtld-servers.net. com. 172800 IN NS i.gtld-servers.net. com. 172800 IN NS l.gtld-servers.net. com. 172800 IN NS c.gtld-servers.net. com. 172800 IN NS k.gtld-servers.net. com. 172800 IN NS d.gtld-servers.net. com. 172800 IN NS f.gtld-servers.net. com. 172800 IN NS b.gtld-servers.net. com. 172800 IN NS a.gtld-servers.net. com. 172800 IN NS e.gtld-servers.net. com. 172800 IN NS g.gtld-servers.net. com. 172800 IN NS j.gtld-servers.net. ;; ADDITIONAL SECTION: a.gtld-servers.net. 172800 IN A 192.5.6.30 a.gtld-servers.net. 172800 IN AAAA 2001:503:a83e::2:30 b.gtld-servers.net. 172800 IN A 192.33.14.30 b.gtld-servers.net. 172800 IN AAAA 2001:503:231d::2:30 c.gtld-servers.net. 172800 IN A 192.26.92.30 d.gtld-servers.net. 172800 IN A 192.31.80.30 e.gtld-servers.net. 172800 IN A 192.12.94.30 f.gtld-servers.net. 172800 IN A 192.35.51.30 g.gtld-servers.net. 172800 IN A 192.42.93.30 h.gtld-servers.net. 172800 IN A 192.54.112.30 i.gtld-servers.net. 172800 IN A 192.43.172.30 j.gtld-servers.net. 172800 IN A 192.48.79.30 k.gtld-servers.net. 172800 IN A 192.52.178.30 l.gtld-servers.net. 172800 IN A 192.41.162.30 ;; Query time: 64 msec ;; SERVER: 198.41.0.4#53(a.root-servers.net) ;; WHEN: Mon Jan 31 09:22:17 2011 ;; MSG SIZE rcvd: 504 ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 12860 ;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 2, ADDITIONAL: 2 ;; QUESTION SECTION: ;ignitemail.com. IN A ;; AUTHORITY SECTION: ignitemail.com. 172800 IN NS ns1.faithhiway.com. ignitemail.com. 172800 IN NS ns2.faithhiway.com. ;; ADDITIONAL SECTION: ns1.faithhiway.com. 172800 IN A 207.200.19.162 ns2.faithhiway.com. 172800 IN A 207.200.50.142 ;; Query time: 152 msec ;; SERVER: 192.54.112.30#53(h.gtld-servers.net) ;; WHEN: Mon Jan 31 09:22:17 2011 ;; MSG SIZE rcvd: 111 ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 43016 ;; flags: qr aa; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 2 ;; QUESTION SECTION: ;ignitemail.com. IN A ;; ANSWER SECTION: ignitemail.com. 3600 IN A 206.127.2.64 ;; AUTHORITY SECTION: ignitemail.com. 3600 IN NS ns1.faithhiway.com. ignitemail.com. 3600 IN NS ns2.faithhiway.com. ;; ADDITIONAL SECTION: ns1.faithhiway.com. 3600 IN A 206.127.2.71 ns2.faithhiway.com. 3600 IN A 206.127.2.72 ;; Query time: 25 msec ;; SERVER: 206.127.2.71#53(ns1.faithhiway.com) ;; WHEN: Mon Jan 31 09:22:18 2011 ;; MSG SIZE rcvd: 127 I really think this is a problem we have somewhere in our setup, but whether it is ignorance of something with DNS on my or my fellow engineer's end or just a dumb mistake we made, I have yet to find it.

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• Error when Sending Emails

  - by dallasclark

  A client of mine keeps receiving the following email when sending mail but their emails are sent successfully. Your outgoing (SMTP) e-mail server has reported an internal error... The server responded: 451 qq read error (#4.3.0) In the mail log (/usr/local/psa/var/log/maillog) I receive the following error: /var/qmail/bin/relaylock[3152]: /var/qmail/bin/relaylock My SMTP Service is setup as followed, if this helps service smtp { socket_type = stream protocol = tcp wait = no disable = no user = root instances = UNLIMITED env = SMTPAUTH=1 server = /var/qmail/bin/tcp-env server_args = -Rt0 /var/qmail/bin/relaylock /var/qmail/bin/qmail-smtpd /var/qmail/bin/smtp_auth /var/qmail/bin/true /var/qmail/bin/cmd5checkpw /var/qmail/bin/true }

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• Can't ssh tunnel to access a remote mysql server

  - by hobbes3

  I can't seem to figure out why I can't use ssh tunnel to connect to my remote MySQL server. I do ssh tunnel with [hobbes3@hobbes3] ~ $ ssh linode -L 3307:localhost:3306 Then on another terminal, I try [hobbes3@hobbes3] ~ $ mysql -h localhost -P 3307 -u root --protocol=tcp -p Enter password: ERROR 2013 (HY000): Lost connection to MySQL server at 'reading initial communication packet', system error: 2 On the server, it shows this: root@li534-120 ~ # channel 4: open failed: connect failed: Connection refused Here is my my.cnf on the server: [mysqld] # Settings user and group are ignored when systemd is used (fedora >= 15). # If you need to run mysqld under different user or group, # customize your systemd unit file for mysqld according to the # instructions in http://fedoraproject.org/wiki/Systemd user=mysql datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock # Disabling symbolic-links is recommended to prevent assorted security risks symbolic-links=0 # Semisynchronous Replication # http://dev.mysql.com/doc/refman/5.5/en/replication-semisync.html # uncomment next line on MASTER ;plugin-load=rpl_semi_sync_master=semisync_master.so # uncomment next line on SLAVE ;plugin-load=rpl_semi_sync_slave=semisync_slave.so # Others options for Semisynchronous Replication ;rpl_semi_sync_master_enabled=1 ;rpl_semi_sync_master_timeout=10 ;rpl_semi_sync_slave_enabled=1 # http://dev.mysql.com/doc/refman/5.5/en/performance-schema.html ;performance_schema [mysqld_safe] log-error=/var/log/mysqld.log pid-file=/var/run/mysqld/mysqld.pid [mysqld] port = 3306 socket=/var/lib/mysql/mysql.sock skip-external-locking key_buffer_size = 64M max_allowed_packet = 128M sort_buffer_size = 512K net_buffer_length = 8K read_buffer_size = 256K read_rnd_buffer_size = 512K myisam_sort_buffer_size = 8M thread_cache = 8 max_connections = 25 query_cache_size = 16M table_open_cache = 1024 table_definition_cache = 1024 tmp_table_size = 32M max_heap_table_size = 32M bind-address = 0.0.0.0 Now sure if this helps but here is the MySQL user list: mysql> select * from mysql.user; +-----------+------+-------------------------------------------+-------------+-------------+-------------+-------------+-------------+-----------+-------------+---------------+--------------+-----------+------------+-----------------+------------+------------+--------------+------------+-----------------------+------------------+--------------+-----------------+------------------+------------------+----------------+---------------------+--------------------+------------------+------------+--------------+------------------------+----------+------------+-------------+--------------+---------------+-------------+-----------------+----------------------+--------+-----------------------+ | Host | User | Password | Select_priv | Insert_priv | Update_priv | Delete_priv | Create_priv | Drop_priv | Reload_priv | Shutdown_priv | Process_priv | File_priv | Grant_priv | References_priv | Index_priv | Alter_priv | Show_db_priv | Super_priv | Create_tmp_table_priv | Lock_tables_priv | Execute_priv | Repl_slave_priv | Repl_client_priv | Create_view_priv | Show_view_priv | Create_routine_priv | Alter_routine_priv | Create_user_priv | Event_priv | Trigger_priv | Create_tablespace_priv | ssl_type | ssl_cipher | x509_issuer | x509_subject | max_questions | max_updates | max_connections | max_user_connections | plugin | authentication_string | +-----------+------+-------------------------------------------+-------------+-------------+-------------+-------------+-------------+-----------+-------------+---------------+--------------+-----------+------------+-----------------+------------+------------+--------------+------------+-----------------------+------------------+--------------+-----------------+------------------+------------------+----------------+---------------------+--------------------+------------------+------------+--------------+------------------------+----------+------------+-------------+--------------+---------------+-------------+-----------------+----------------------+--------+-----------------------+ | localhost | root | *664328D3C5E263F4FB25185681AAE7E92B01B2B0 | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | | | | | 0 | 0 | 0 | 0 | | | | 127.0.0.1 | root | *664328D3C5E263F4FB25185681AAE7E92B01B2B0 | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | | | | | 0 | 0 | 0 | 0 | | | | ::1 | root | *664328D3C5E263F4FB25185681AAE7E92B01B2B0 | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y | | | | | 0 | 0 | 0 | 0 | | | +-----------+------+-------------------------------------------+-------------+-------------+-------------+-------------+-------------+-----------+-------------+---------------+--------------+-----------+------------+-----------------+------------+------------+--------------+------------+-----------------------+------------------+--------------+-----------------+------------------+------------------+----------------+---------------------+--------------------+------------------+------------+--------------+------------------------+----------+------------+-------------+--------------+---------------+-------------+-----------------+----------------------+--------+-----------------------+ 3 rows in set (0.00 sec) I read about how MySQL treats localhost vs 127.0.0.1 as connecting via a socket or TCP, respectively. But I'm starting to get confused on what's really going on or if socket vs TCP is even the issue. Thanks in advance and I'm open for any tips and suggestions! Some more info: My MySQL client, running OS X 10.8.4, is mysql Ver 14.14 Distrib 5.6.10, for osx10.8 (x86_64) using EditLine wrapper My MySQL server, running on CentOS 6.4 32-bit, is mysql> SHOW VARIABLES LIKE "%version%"; +-------------------------+--------------------------------------+ | Variable_name | Value | +-------------------------+--------------------------------------+ | innodb_version | 1.1.8 | | protocol_version | 10 | | slave_type_conversions | | | version | 5.5.28 | | version_comment | MySQL Community Server (GPL) by Remi | | version_compile_machine | i686 | | version_compile_os | Linux | +-------------------------+--------------------------------------+ 7 rows in set (0.00 sec)

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• how to reset the IIS settings ..

  - by infant programmer

  I had been practicing ASP on my local machine.. I just wanted to change the TCP port address to 8080 and that is what I did, since then the URL "http://localhost/" is showing PAGE CANNOT BE DISPLAYED, and technical reason being shown is : "You have attempted to execute a CGI, ISAPI, or other executable program from a directory that does not allow programs to be executed." I tried to change back the TCP port address to 80, (which is default) but its not making any difference. What should I do now, to make localhost to work as before ? When I create a virtual directory for the same path "C:/InetPub/wwwroot" then it works but with this URL "http://localhost/virualname/filename.asp" .. where as "http://localhost/filename.asp" throws error, as mentioned above. Can you please explain me what is this consequence is?? thank you :) Details: IIS verion is 7, OS XP,

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• Wireless clients have no route to ethernet clients in OpenWrt router

  - by superjoe30

  I'm using OpenWrt Kamikaze 8.09 on a Linksys WRT54g v1.1 router. I just flashed it with default settings and got everything working, except my wireless laptop cannot ping my desktop which is wired to the router. What can I do to fix this? (My desktop can ping other desktops wired to the router) My routing table: config 'defaults' option 'syn_flood' '1' option 'input' 'ACCEPT' option 'output' 'ACCEPT' option 'forward' 'REJECT' config 'zone' option 'name' 'lan' option 'input' 'ACCEPT' option 'output' 'ACCEPT' option 'forward' 'REJECT' config 'zone' option 'name' 'wan' option 'input' 'REJECT' option 'output' 'ACCEPT' option 'forward' 'REJECT' option 'masq' '1' config 'forwarding' option 'src' 'lan' option 'dest' 'wan' option 'mtu_fix' '1' config 'redirect' option 'src' 'wan' option '_name' 'ssh' option 'proto' 'tcp' option 'src_dport' '22' option 'dest_ip' '192.168.1.100' option 'dest_port' '22' config 'redirect' option 'src' 'wan' option '_name' 'http' option 'proto' 'tcp' option 'src_dport' '8888' option 'dest_ip' '192.168.1.100' option 'dest_port' '8888'

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• ActiveMQ Pure Master / Slave - Out of sync

  - by pico

  What i have : 1 master broker and 1 slave broker both in ActiveMQ 5.4.0 What i use : waitForSlave on master side and failover uri on slave side (in the master connector URI) What i want to do : I want to wait some delay (like 5 seconds) in case of a tiny network failures between master and slave before starting slave transpôrt connectors So i put this in slave config : <broker xmlns="http://activemq.apache.org/schema/core" brokerName="slave" dataDirectory="${activemq.base}/data" useJmx="true" persistent="true" populateJMSXUserID="true" masterConnectorURI="failover://(tcp://master:61616)?initialReconnectDelay=1000&amp;maxReconnectDelay=30000" shutdownOnMasterFailure="false" advisorySupport="false"> It seems to work but after a network hang between master and slave, the slave reconnect successfully and then the master logs a lot of : 2010-10-18 17:08:44,421 | ERROR | Slave Failed | org.apache.activemq.broker.ft.MasterBroker | ActiveMQ Task java.lang.IllegalStateException: Cannot lookup a connection that had not been registered: ID:master-1040-634226732611718750-0:0 at org.apache.activemq.broker.MapTransportConnectionStateRegister.lookupConnectionState(MapTransportConnectionStateRegister.java:93) at org.apache.activemq.broker.TransportConnection.lookupConnectionState(TransportConnection.java:1412) at org.apache.activemq.broker.TransportConnection.processRemoveConsumer(TransportConnection.java:561) at org.apache.activemq.command.RemoveInfo.visit(RemoveInfo.java:76) at org.apache.activemq.broker.TransportConnection.service(TransportConnection.java:309) at org.apache.activemq.broker.TransportConnection$1.onCommand(TransportConnection.java:185) at org.apache.activemq.transport.ResponseCorrelator.onCommand(ResponseCorrelator.java:116) at org.apache.activemq.transport.TransportFilter.onCommand(TransportFilter.java:69) at org.apache.activemq.transport.vm.VMTransport.iterate(VMTransport.java:218) at org.apache.activemq.thread.DedicatedTaskRunner.runTask(DedicatedTaskRunner.java:98) at org.apache.activemq.thread.DedicatedTaskRunner$1.run(DedicatedTaskRunner.java:36) On the slave side everything is fine. So after that, i've tried to stop the master to see if the slave is capable of turning master after these "network hangs". The master took long time to shutdown (10 seconds) and then some error message appears in slave logs : 2010-10-18 17:09:32,915 | WARN | Async error occurred: java.lang.IllegalStateException: Cannot lookup a connection that had not been registered: ID:master-1049-634226732657812500-0:3 | org.apache.activemq.broker.TransportConnection.Service | VMTransport: vm://slave#5 java.lang.IllegalStateException: Cannot lookup a connection that had not been registered: ID:master-1049-634226732657812500-0:3 at org.apache.activemq.broker.MapTransportConnectionStateRegister.lookupConnectionState(MapTransportConnectionStateRegister.java:93) at org.apache.activemq.broker.TransportConnection.lookupConnectionState(TransportConnection.java:1412) at org.apache.activemq.broker.TransportConnection.processRemoveSession(TransportConnection.java:600) at org.apache.activemq.command.RemoveInfo.visit(RemoveInfo.java:74) at org.apache.activemq.broker.TransportConnection.service(TransportConnection.java:309) at org.apache.activemq.broker.TransportConnection$1.onCommand(TransportConnection.java:185) at org.apache.activemq.transport.ResponseCorrelator.onCommand(ResponseCorrelator.java:116) at org.apache.activemq.transport.TransportFilter.onCommand(TransportFilter.java:69) at org.apache.activemq.transport.vm.VMTransport.iterate(VMTransport.java:218) at org.apache.activemq.thread.DedicatedTaskRunner.runTask(DedicatedTaskRunner.java:98) at org.apache.activemq.thread.DedicatedTaskRunner$1.run(DedicatedTaskRunner.java:36) Are they any ways to keep my kaha stores (they are individual stores) synchronised? The main problem is that the slave never turn master after a master failure, it stay block on this message : 2010-10-18 17:09:33,681 | WARN | Transport (master/172.21.60.61:61616) failed to tcp://master:61616 , attempting to automatically reconnect due to: java.net.SocketException: Software caused connection abort: socket write error | org.apache.activemq.transport.failover.FailoverTransport | ActiveMQ Transport: tcp://master/172.21.60.61:61616 I'm totally stuck with these syncs problems, any help welcome! Regards

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• Are there netcat-like tools for Windows which are not quarantined as malware?

  - by Matthew Murdoch

  I used to use netcat for Windows to help track down network connectivity issues. However these days my anti-virus software (Symantec - but I understand others display similar behaviour) quarantines netcat.exe as malware. Are there any alternative applications which provide at least the following functionality: can connect to an open TCP socket and send data to it which is typed on the console can open and listen on a TCP socket and print received data to the console ? I don't need the 'advanced' features (which are possibly the reason for the quarantining) such as port scanning or remote execution.

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• How could two processes bind onto the same port?

  - by Matt Ball

  I just ran into an issue where a request made to localhost:8080 from curl was hitting a different server than the same request made from inside Node. lsof -i :8080 revealed that two processes were both binding onto the same port: COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME node 51961 mball 14u IPv4 0xd980e0df7f175e13 0t0 TCP *:http-alt (LISTEN) java 62704 mball 320u IPv6 0xd980e0df7fe08643 0t0 TCP *:http-alt (LISTEN) How is this possible? Were they binding onto different interfaces? Or was it the IPv4 vs 6? If you're curious, node was hitting the other node process, curl was hitting the java process. The java process was started after the node process.

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• Web Security: Worst-Case Situation

  - by Yongho

  I currently have built a system that checks user IP, browser, and a random-string cookie to determine if he is an admin. In the worst case, someone steals my cookie, uses the same browser I do, and masks his IP to appear as mine. Is there another layer of security I should add onto my script to make it more secure?

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• Postfix SMTP server down on Ubuntu

  - by Paddington

  I have a Plesk server running Postfix on Ubuntu 10.04 and the SMTP service on port 25 is down. When I stop and then start postfix the server comes up only for a minute and goes down again. I have checked the load on the server and it is low as shown: *top - 04:29:33 up 19 days, 3:25, 4 users, load average: 1.47, 1.78, 2.34 Tasks: 936 total, 1 running, 935 sleeping, 0 stopped, 0 zombie Cpu(s): 0.7%us, 0.3%sy, 0.0%ni, 86.6%id, 11.7%wa, 0.6%hi, 0.1%si, 0.0%st Mem: 6110496k total, 6072988k used, 37508k free, 251244k buffers Swap: 12000544k total, 95264k used, 11905280k free, 4370432k cached* IMAP clients are not experiencing a problem and there are no issues with receiving emails for both POP or IMAP. Only SMTP (port 25) is a problem. If I ask clients to use the submission port (587) messages are delivered. netstat -lnt shows the following results , so its not a port issue. tcp 0 0 0.0.0.0:25 0.0.0.0: LISTEN tcp 0 0 0.0.0.0:8443 0.0.0.0:* LISTEN*

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• Whois list of Top Level Domain against their corresponding registrar

  - by Daniel

  I'm trying to find a list of TLD's to their corresponding whois server, for example .com americanWhoisServer .net someOtherWhoisServer .au australianWhoisServer In the end i'm aiming for something like a Dictionary where the key is the TLD and the value is the whois server address (eg whois.apnic.net). Ah snap, i just realised that i am given the IP addresses and not domain names but a list could still come in handy. How can i determine which whois server to use given a IP address? Guess and check?

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• how to enable remote access to a MySQL server on an AZURE virtual machine

  - by Rees

  I have an AZURE virtual machine with a MySQL server installed on it running ubuntu 13.04. I am trying to remote connect to the MySQL server however get the simple error "Can't connect to MySQL server on {IP}" I have already done the follow: * commented out the bind-address within the /etc/mysql/my.cnf * commented out skip-external-locking within the same my.cnf * "ufw allow mysql" * "iptables -A INPUT -i eth0 -p tcp -m tcp --dport 3306 -j ACCEPT" * setup an AZURE endpoint for mysql * "sudo netstat -lpn | grep 3306" does indeed show mysql LISTENING * "GRANT ALL ON *.* TO remote@'%' IDENTIFIED BY 'password'; * "GRANT ALL ON *.* TO remote@'localhost' IDENTIFIED BY 'password'; * "/etc/init.d/mysql restart" * I can connect via SSH tunneling, but not without it * I have spun up an identical ubuntu 13.04 server on rackspace and SUCCESSFULLY connected using the same procedures outlined here. NONE of the above works on my azure server however. I thought the creation of an endpoint would work, but no luck. Any help please? Is there something I'm missing entirely?

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• Tutorial for configuring OpenVPN [on hold]

  - by user2699451

  I have been through 10+ tutorials on setting up a OpenVPN, and each tutorial gives a different problem... Does anyone know of a decent and helpful website/tutorial which I could go to to get it set up? I have been battling through it for almost 2 months now. Yes, I have also bugged forums.openvpn, but I think I have "reached my post limit" with them. I have to configure it remotely via ssh. UPDATE: okay, I have been asked to be more clear on the topic I followed this tutorial (as a example) - http://www.servermom.com/how-to-build-openvpn-server-on-centos-6-x/732/ I had no issues setting up, etc. except when I boot into windows and run the OpenVPN GUI Client, it connects and gives this error: WARNING: Bad encapsulated packet length from peer (21331), which must be 0 and <= 1576 -- please ensure that --tun-mtu or --link-mtu is equal on both peers -- this condition could also indicate a possible active attack on the TCP link -- [Attemping restart...] Here is my server config: port 1194 #- port proto udp #- protocol dev tun tun-mtu 1500 tun-mtu-extra 32 mssfix 1450 reneg-sec 0 ca /etc/openvpn/easy-rsa/2.0/keys/ca.crt cert /etc/openvpn/easy-rsa/2.0/keys/server.crt key /etc/openvpn/easy-rsa/2.0/keys/server.key dh /etc/openvpn/easy-rsa/2.0/keys/dh1024.pem plugin /usr/lib64/openvpn/plugin/lib/openvpn-auth-pam.so /etc/pam.d/login #- Co$ #plugin /etc/openvpn/radiusplugin.so /etc/openvpn/radiusplugin.cnf #- Uncomment$ client-cert-not-required username-as-common-name server 10.8.0.0 255.255.255.0 push "redirect-gateway def1" push "dhcp-option DNS 8.8.8.8" push "dhcp-option DNS 8.8.4.4" keepalive 5 30 comp-lzo persist-key persist-tun status 1194.log verb 3 and my client config: client dev tun proto udp remote [server ip] 1194 # - Your server IP and OpenVPN Port resolv-retry infinite nobind tun-mtu 1500 tun-mtu-extra 32 mssfix 1450 persist-key persist-tun ca ca.crt auth-user-pass comp-lzo reneg-sec 0 verb 3 OpenVPN Client Log: Thu Oct 31 11:51:29 2013 OpenVPN 2.0.9 Win32-MinGW [SSL] [LZO] built on Oct 1 2006 Thu Oct 31 11:51:44 2013 IMPORTANT: OpenVPN's default port number is now 1194, based on an official port number assignment by IANA. OpenVPN 2.0-beta16 and earlier used 5000 as the default port. Thu Oct 31 11:51:44 2013 WARNING: No server certificate verification method has been enabled. See http://openvpn.net/howto.html#mitm for more info. Thu Oct 31 11:51:44 2013 LZO compression initialized Thu Oct 31 11:51:44 2013 Control Channel MTU parms [ L:1576 D:140 EF:40 EB:0 ET:0 EL:0 ] Thu Oct 31 11:51:44 2013 Data Channel MTU parms [ L:1576 D:1450 EF:44 EB:135 ET:32 EL:0 AF:3/1 ] Thu Oct 31 11:51:44 2013 Local Options hash (VER=V4): '2547efd2' Thu Oct 31 11:51:44 2013 Expected Remote Options hash (VER=V4): '77cf0943' Thu Oct 31 11:51:44 2013 Attempting to establish TCP connection with x.x.x.x:1194 Thu Oct 31 11:51:44 2013 TCP connection established with x.x.x.x:1194 Thu Oct 31 11:51:44 2013 TCPv4_CLIENT link local: [undef] Thu Oct 31 11:51:44 2013 TCPv4_CLIENT link remote: x.x.x.x:1194 // after this it just hangs, nothing happens So I dont know what I am doing wrong but I am getting a bit impatient and on each forum I post this, I get stupid/unrelated/unhelpful answers...

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• Why is port 444 open on this router?

  - by TJ Thind

  I have a Cisco RV110W. I ran nmap at it from the outside and nmap reports that the router has tcp port 444 open. Yet there are no port forwarding rules specifying this port. It should as far as I can tell, be closed. There's even a service listening to that port which I can connect to through telnet. I threw some SNPP commands at it but the service doesn't respond to any of them so I don't believe it's SNPP. Does anyone have any idea why this particular router has tcp port 444 open? I haven't been able to find anything in the manual or on Cisco's website.

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• How to bypass AllowTCPFowarding=no by installing own forwarder?

  - by Eric B.

  In the man pages for sshd_config, for the AllowTCPForwarding option, it states: AllowTcpForwarding Specifies whether TCP forwarding is permitted. The default is “yes”. Note that disabling TCP forwarding does not improve security unless users are also denied shell access, as they can always install their own forwarders. How do I install my own forwarder? I have a remote server in which I disabled TCPForwarding a long while ago. I would like to "enable" it for myself only, by using my own forwarder, while keeping the forwarding closed to the other users. I've looked around, but cannot seem to find the right pkgs to accomplish this. Can anyone please elaborate? Thanks! Eric

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• Slower than expected 802.11n wireless network speeds

  - by Ian

  I have two ASUS laptops running Windows 7 connected wirelessly via 802.11n at 150 Mbit, as reported by Task Manager. The router is Netgear WNDR3700. When testing the wireless connection speed using iperf, I'm not getting nearly 150 Mbit: C:\>iperf -c 10.0.0.123 -t 30 ------------------------------------------------------------ Client connecting to 10.0.0.123, TCP port 5001 TCP window size: 8.00 KByte (default) ------------------------------------------------------------ [148] local 10.0.0.116 port 53819 connected with 10.0.0.123 port 5001 [ ID] Interval Transfer Bandwidth [148] 0.0-30.0 sec 41.2 MBytes 11.5 Mbits/sec That's a typical result. Running parallel client threads does not increase the overall total speed. Why would I only be getting 11.5 Mbit on a 150 Mbit connection?

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• open mysql to any connection on ubuntu

  - by ThomasReggi

  I simply want to open up mysql to be accessible from any server ip. I have already commented out the bind-address in /etc/mysql/my.conf. I have already setup the user account within mysql. I have no clue whats stopping me from connecting. The more challenging I see this being the more I realize how much of a security risk it is, and I get that, I just want to be able to do it temporarily. I think that the iptables firewall is the last thing that is preventing me from achieving this, but sudo iptables -A INPUT -p tcp -m tcp --dport 3306 -j ACCEPT is seemingly doing nothing.

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• afp/smb transfers caps at 2 megabytes/sec, wireless N

  - by CQM

  I wanted to transfer files between two mac computers. The network is wireless-N and both computers have wireless-N modules in them. The problem is that when I transfer files between them, via file sharing (afp) the network speed caps at 2 megabytes/sec. Just downloading files from the internet I can get faster speeds, so this isn't a constriction of my wifi bandwidth, it appears to be a constriction of the protocol being used. My wifi-n is set to 130mbits, so I should see real world transfer speeds around 12-16 megabytes/sec I did this command on both computers sudo sysctl -w net.inet.tcp.delayed_ack=0 which is supposed to lower tcp overhead, but this did not affect it. How can I get the speed I am expecting?

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• iptables: How to read this OPT string?

  - by alex

  I have a simple INPUT rule for iptables that logs any new connections to a logfile. --log-tcp-options and --log-ip-options flags are both set and I get the appropriate OPT output. One line of my log looks something like this: Nov 29 17:00:00 IN=venet0 OUT= MAC= SRC=x.x.x.x DST=x.x.x.x LEN=64 TOS=0x00 PREC=0x00 TTL=53 ID=37898 DF PROTO=TCP SPT=57755 DPT=8888 WINDOW=65535 RES=0x00 SYN URGP=0 OPT (0204057D010303010101080A3E521D4D0000000004020000) I would like to understand how to interpret the OPT string (bold). Is there some documentation available on what it actually means? How could I make it human-readable?

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• IPvsadm not equally balancing on wlc scheduler

  - by davidsmalley

  For some reason, ipvsadm does not seem to be equally balancing the connections between my real servers when using the wlc or lc schedulers. One real server gets absolutely hammered with requests while the others receive relatively few connections. My ldirectord.cf file looks like this: quiescent = yes autoreload = yes checktimeout = 10 checkinterval = 10 # *.site.com http virtual = 111.111.111.111:http real = 10.10.10.1:http ipip 10 real = 10.10.10.2:http ipip 10 real = 10.10.10.3:http ipip 10 real = 10.10.10.4:http ipip 10 real = 10.10.10.5:http ipip 10 scheduler = lc protocol = tcp service = http checktype = negotiate request = "/lb" receive = "Up and running" virtualhost = "site.com" fallback = 127.0.0.1:http The weird thing that I think may be causing the problem (but I'm really not sure) is that ipvsadm doesn't seem to be tracking active connections properly, they all appear as inactive connections IP Virtual Server version 1.2.1 (size=4096) Prot LocalAddress:Port Scheduler Flags -> RemoteAddress:Port Forward Weight ActiveConn InActConn TCP 111.111.111.111:http lc -> 10.10.10.1:http Tunnel 10 0 10 -> 10.10.10.2:http Tunnel 10 0 18 -> 10.10.10.3:http Tunnel 10 0 3 -> 10.10.10.4:http Tunnel 10 0 10 -> 10.10.10.5:http Tunnel 10 0 5 If I do ipvsadm -Lnc then I see lots of connections but only ever in ESTABLISHED & FIN_WAIT states. I was using ldirectord previously on a Gentoo based load balancer and the activeconn used to be accurate, since moving to Ubuntu 10.4 LTS something seems to be different. # ipvsadm -v ipvsadm v1.25 2008/5/15 (compiled with popt and IPVS v1.2.1) So, is ipvsadm not tracking active connections properly and thus making load balancing work incorrectly and if so, how do I get it to work properly again? Edit: It gets weirder, if I cat /proc/net/ip_vs then it looks like the correct activeconns are there IP Virtual Server version 1.2.1 (size=4096) Prot LocalAddress:Port Scheduler Flags -> RemoteAddress:Port Forward Weight ActiveConn InActConn TCP B86A9732:0050 rr -> 0AB42453:0050 Tunnel 10 1 24 -> 0AB4321D:0050 Tunnel 10 0 23 -> 0AB426B2:0050 Tunnel 10 2 25 -> 0AB4244C:0050 Tunnel 10 2 22 -> 0AB42024:0050 Tunnel 10 2 23

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• how to fetch a url with javascript/jquery?

  - by fayer

  i need to fetch a url with javascript/jquery and not php. i've read that you could do that if you got a php proxy, but that means that it is still going through php. cause then it's still the ip of the server that is fetching it. could one fetch the url entirely with only front-end, and thus fetch it with the client's ip?

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• getting input/output error from NFS client on RHEL5

  - by Andrew Watson

  i have two RHEL5 boxes on a private network together (192.168.2.0/24) and I am trying to export a file system from one to the other but I keep getting the following error: mount.nfs: Input/output error on the client side I see this output: mount: trying 192.168.2.101 prog 100003 vers 3 prot tcp port 2049 mount: trying 192.168.2.101 prog 100005 vers 3 prot tcp port 960 and on the server side I see this: Sep 20 14:14:32 omicron mountd[18739]: authenticated mount request from 192.168.2.87:635 for /srv/nfs/web (/srv/nfs/web) but that's all. I opened up iptables so that the whole 192.168.2.0/24 network is allowed to communicate freely but the public side is locked down to 22,80 etc.... any ideas?

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• Cloudify: bootstrap-localcloud: operation failed?

  - by quanta

  OS: Gentoo, CentOS Version: 2.1.0 Follow the quick start guide, I got the below error when running bootstrap-localcloud: cloudify@default> bootstrap-localcloud STARTING CLOUDIFY MANAGEMENT 2012-05-30 14:55:50,396 WARNING [org.cloudifysource.shell.commands.AbstractGSCommand] - ; \ Caused by: org.cloudifysource.shell.commands.CLIException: \ Error while starting agent. \ Please make sure that another agent is not already running. Operation failed. What port Cloudify is using to check that agent is running? PS: it's working fine when running on Windows. UPDATE: Wed May 30 22:37:30 ICT 2012 Reply to @tamirkorem and @Itai Frenkel: I'm pretty sure because this is the first time I run that command on 2 servers. More clearly, here're the output: cloudify@default> teardown-localcloud Teardown will uninstall all of the deployed services. Do you want to continue [y/n]? 2012-05-30 22:43:33,145 WARNING [org.cloudifysource.shell.commands.AbstractGSCommand] - Teardown failed. Failed to fetch the currently deployed applications list. For force teardown use the -force flag. Operation failed. cloudify@default> teardown-localcloud -force Teardown will uninstall all of the deployed services. Do you want to continue [y/n]? Failed to fetch the currently deployed applications list. Continuing teardown-localcloud. .2012-05-30 22:46:39,040 WARNING [org.cloudifysource.shell.commands.AbstractGSCommand] - Teardown aborted, an agent was not found on the local machine. Operation failed. and this one is the detailed result: cloudify@default> bootstrap-localcloud --verbose NIC Address=127.0.0.1 Lookup Locators=127.0.0.1:4172 Lookup Groups=localcloud Starting agent and management processes: gs-agent.sh gsa.global.lus 0 gsa.lus 0 gsa.gsc 0 gsa.global.gsm 0 gsa.gsm_lus 1 gsa.global.esm 0 gsa.esm 1 >/dev/null 2>&1 STARTING CLOUDIFY MANAGEMENT 2012-05-30 22:36:12,870 WARNING [org.cloudifysource.shell.commands.AbstractGSCommand] - ; Caused by: org.cloudifysource.shell.commands.CLIException: Error while starting agent. Please make sure that another agent is not already running. Command executed: /usr/local/src/gigaspaces-cloudify-2.1.0-ga/bin/gs-agent.sh gsa.global.lus 0 gsa.lus 0 gsa.gsc 0 gsa.global.gsm 0 gsa.gsm_lus 1 gsa.global.esm 0 gsa.esm 1 >/dev/null 2>&1 Reply to @Eliran Malka: there is no such process listening on port 4172: # netstat --protocol=inet -nlp Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 127.0.0.1:9050 0.0.0.0:* LISTEN 2363/tor tcp 0 0 127.0.0.1:3306 0.0.0.0:* LISTEN 2331/mysqld tcp 0 0 127.0.0.1:631 0.0.0.0:* LISTEN 2293/cupsd

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• Cisco pix command - whats this command mean?

  - by jason clark

  Hi, Anyone know what the following means? I have these two lines in our cisco PIX configuration file but have no references to these IP's anywhere else in the config and cant find a device on the network with them. global (inet) 10 213.228.xxx.xx global (inet) 20 213.228.xxx.xx thanks, Jason (BTW: I've xxx'ed out the remainder of the ip for security :-0 )

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