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• bind9 "error sending response: host unreachable"

  - by wolfgangsz

  of course), I have a number of DNS servers, all running bind9 (9.5.1, to be specific) under fedora. 4 of them are slaves, fed by a common master for our public DNS. These are all located on the public gateways of our various offices. One of them has tons of messages in its log files similar to these: Jul 21 17:26:18 gateway named[3487]: client 10.171.3.8#52500: view internal: error sending response: host unreachable I wonder where that comes from. The firewall is open on port 53 between the two machines (10.171.3.8 is an internal DNS server located on a Windows Domain Controller). The internal domains do NOT list the gateway as a name server (so there should not be any attempts of replicating the domains), and the gateway does not handle any internal DNS. The clients in these messages vary between the two domain controllers on the internal network and a third internal name server (running bind9 on debian in a different segment of the network). Any pointers are highly welcome. In response to the first reply: The issue with this really is that tcpdump doesn't show any problems. Here is an extract from "tcpdump -i any port 53" 09:13:38.283308 IP valine.aminocom.com.61815 ns-pri.ripe.net.domain: 14075 PTR? 166.225.58.95.in-addr.arpa. (44) 09:13:42.007410 IP gateway-eng.aminocom.com.37047 alanine.aminocom.com.domain: 35410+ PTR? 12.3.172.10.in-addr.arpa. (42) At the same time, the DNS log shows: Jul 22 09:13:38 gateway named[3487]: client 10.171.3.6#61300: view internal: error sending response: host unreachable Jul 22 09:13:40 gateway named[3487]: client 10.172.3.12#56230: view internal: error sending response: host unreachable Jul 22 09:13:40 gateway named[3487]: client 10.171.3.8#55221: view internal: error sending response: host unreachable Jul 22 09:13:49 gateway named[3487]: client 10.171.3.8#51342: view internal: error sending response: host unreachable So clearly at 09:13:40 there were two unsuccessful attempts to connect to internal machines (10.172.3.12 and 10.171.3.8, both are DNS servers), but nothing in the tcpdump output.

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• How to get nginx to serve up on an elastic IP

  - by geekbri

  I have an EC2 instance which is serving up PHP pages with nginx and php-fpm. This works perfectly fine when accessed through the public DNS for the instance. However if I try to access the site with the Elastic IP which is bound to it, it serves up a generic "Welcome to nginx" page, even though in my server block i have listen 80 (which i thought listened on all incoming IPs on port 80). Here is my nginx config. server { listen 80; access_log /var/log/nginx/access.log; root "/var/www/clipperz/"; index index.html index.php; # Default location location / { try_files $uri $uri/ index.html; } # Parse all .php file in the $document_root directory location ~ .php$ { include fastcgi_params; fastcgi_pass 127.0.0.1:9000; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; } }

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• IIS7 returns 403.1 (execute access denied) for image file

  - by Kristoffer

  I have a web app running in IIS7 on Windows Server 2008. There is a virtual directory pointing to a shared folder "/Content/Data" on another machine (running Windows Server 2003), as well as a real directory "/Content/Images" on the local machine (web app sub folder). Accessing images in "/Content/Images" is no problem, but when an image (e.g. a JPEG file) in the "/Content/Data" is accessed by a browser, IIS returns this error: HTTP Error 403.1 - Forbidden: Execute access is denied. However, the web app can read and write to / from it. I assume IIS and ASP.NET are running under different user accounts? Does anyone have an idea on what I have to do to make it work? I have set the permissions on the shared folder to Everyone Full Control, with no luck.

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• Can't install new database in OpenLDAP 2.4 with BDB on Debian

  - by Timothy High

  I'm trying to install an openldap server (slapd) on a Debian EC2 instance. I have followed all the instructions I can find, and am using the recommended slapd-config approach to configuration. It all seems to be just fine, except that for some reason it can't create my new database. ldap.conf.bak (renamed to ensure it's not being used): ########## # Basics # ########## include /etc/ldap/schema/core.schema include /etc/ldap/schema/cosine.schema include /etc/ldap/schema/nis.schema include /etc/ldap/schema/inetorgperson.schema pidfile /var/run/slapd/slapd.pid argsfile /var/run/slapd/slapd.args loglevel none modulepath /usr/lib/ldap # modulepath /usr/local/libexec/openldap moduleload back_bdb.la database config #rootdn "cn=admin,cn=config" rootpw secret database bdb suffix "dc=example,dc=com" rootdn "cn=manager,dc=example,dc=com" rootpw secret directory /usr/local/var/openldap-data ######## # ACLs # ######## access to attrs=userPassword by anonymous auth by self write by * none access to * by self write by * none When I run slaptest on it, it complains that it couldn't find the id2entry.bdb file: root@server:/etc/ldap# slaptest -f ldap.conf.bak -F slapd.d bdb_db_open: database "dc=example,dc=com": db_open(/usr/local/var/openldap-data/id2entry.bdb) failed: No such file or directory (2). backend_startup_one (type=bdb, suffix="dc=example,dc=com"): bi_db_open failed! (2) slap_startup failed (test would succeed using the -u switch) Using the -u switch it works, of course. But that merely creates the configuration. It doesn't resolve the underlying problem: root@server:/etc/ldap# slaptest -f ldap.conf.bak -F slapd.d -u config file testing succeeded Looking in the database directory, the basic files are there (with right ownership, after a manual chown), but the dbd file wasn't created: root@server:/etc/ldap# ls -al /usr/local/var/openldap-data total 4328 drwxr-sr-x 2 openldap openldap 4096 Mar 1 15:23 . drwxr-sr-x 4 root staff 4096 Mar 1 13:50 .. -rw-r--r-- 1 openldap openldap 3080 Mar 1 14:35 DB_CONFIG -rw------- 1 openldap openldap 24576 Mar 1 15:23 __db.001 -rw------- 1 openldap openldap 843776 Mar 1 15:23 __db.002 -rw------- 1 openldap openldap 2629632 Mar 1 15:23 __db.003 -rw------- 1 openldap openldap 655360 Mar 1 14:35 __db.004 -rw------- 1 openldap openldap 4431872 Mar 1 15:23 __db.005 -rw------- 1 openldap openldap 32768 Mar 1 15:23 __db.006 -rw-r--r-- 1 openldap openldap 2048 Mar 1 15:23 alock (note that, because I'm doing this as root, I had to also change ownership of some of the files created by slaptest) Finally, I can start the slapd service, but it dies in the attempt (text from syslog): Mar 1 15:06:23 server slapd[21160]: @(#) $OpenLDAP: slapd 2.4.23 (Jun 15 2011 13:31:57) $#012#011@incagijs:/home/thijs/debian/p-u/openldap-2.4.23/debian/build/servers/slapd Mar 1 15:06:23 server slapd[21160]: config error processing olcDatabase={1}bdb,cn=config: Mar 1 15:06:23 server slapd[21160]: slapd stopped. Mar 1 15:06:23 server slapd[21160]: connections_destroy: nothing to destroy. I manually checked the olcDatabase={1}bdb file, and it looks fine to my amateur eye. All my specific configs are there. Unfortunately, syslog isn't reporting a specific error in this case (if it were a file permission error, it would say). I've tried uninstalling and reinstalling slapd, changing permissions, Googling my wits out, but I'm tapped out. Any OpenLDAP genius out there would be greatly appreciated!

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• Setting up Apache 2.2 + FastCGI + SuExec + PHP-FPM on Centos 6

  - by mr1031011

  I'm trying to follow this very detailed instruction here, I simply changed from www-data user to apache user, and is using /var/www/hosts/sitename/public_html instead of /home/user/public_html However, I spent the whole day trying to figure out why the php file content is displayed without being parsed correctly. I just cant's seem to figure this out. Below is my current config: /etc/httpd/conf.d/fastcgi.conf User apache Group apache LoadModule fastcgi_module modules/mod_fastcgi.so # dir for IPC socket files FastCgiIpcDir /var/run/mod_fastcgi # wrap all fastcgi script calls in suexec FastCgiWrapper On # global FastCgiConfig can be overridden by FastCgiServer options in vhost config FastCgiConfig -idle-timeout 20 -maxClassProcesses 1 # sample PHP config # see /usr/share/doc/mod_fastcgi-2.4.6 for php-wrapper script # don't forget to disable mod_php in /etc/httpd/conf.d/php.conf! # # to enable privilege separation, add a "SuexecUserGroup" directive # and chown the php-wrapper script and parent directory accordingly # see also http://www.brandonturner.net/blog/2009/07/fastcgi_with_php_opcode_cache/ # FastCgiServer /var/www/www-data/php5-fcgi #AddType application/x-httpd-php .php AddHandler php-fcgi .php Action php-fcgi /fcgi-bin/php5-fcgi Alias /fcgi-bin/ /var/www/www-data/ #FastCgiExternalServer /usr/lib/cgi-bin/php5-fcgi -socket /tmp/php5-fpm.sock -pass-header Authorization #DirectoryIndex index.php # <Location /fcgi-bin/> # Order Deny,Allow # Deny from All # Allow from env=REDIRECT_STATUS SetHandler fcgid-script Options +ExecCGI </Location> /etc/httpd/conf.d/vhost.conf <VirtualHost> DirectoryIndex index.php index.html index.shtml index.cgi SuexecUserGroup www.mysite.com mygroup Alias /fcgi-bin/ /var/www/www-data/www.mysite.com/ DocumentRoot /var/www/hosts/mysite.com/w/w/w/www/ <Directory /var/www/hosts/mysite.com/w/w/w/www/> Options -Indexes FollowSymLinks AllowOverride None Order allow,deny allow from all </Directory> </VirtualHost> PS: 1. Also, with PHP5.5, do I even need FPM or is it already included? 2. I'm using mod_fastcgi, not sure if this is the problem and it I should switch to mod_fcgid? There seems to be conflicting records on the internet considering which one is better. I have many virtual hosts running on the machine and hope to be able to provide each user with their own opcache

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• DNSMASQ configuration

  - by sean

  I am using DNSmasq, OpenDNS and DYNDNS. DYNDNS is for my FTP site, and I am using OPEN DNS to filter porn from my kids itouch/ipad. However, I would like a few computers to have the capability to bypass openDNS, and pass through to a fast DNS server like google or similar. I would also like to fowrard all traffice from DYNDNS to my FTP server. Any ideas? This is what I have thus far.. strict-order dhcp-mac=filter,00:25:64:DB:A8:8A dhcp-option=net:filter,6,8.8.8.8,8.8.4.4 Its not working thus far, can someone help me accomplish what I want to do?

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• How to achieve zero down time

  - by Hiral Lakdavala

  For an application we want to achieve zero database and application down time using Active Active configuration. Our dB is Oracle Following are my questions: How can we achieve active active configuration in Oracle? Will introducing Cassandra/HBase(or any other No SQL dbs) cloud help in zero downtime or it is only for fast retrieval of data in a large db? Any other options? Thanks and Regards, Hiral

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• Project Server 2007 Task Updates hangs on 'Loading Grid...'

  - by Greg Buehler

  A strange problem began occurring after applying MOSS2 (KB953334) and the August 2009 cumulative update to our Project server. When a user enters the 'Task Update' screen they are prompted to download a new ActiveX control. Upon refresh, and subsequent access attempts, the user is presented with a blank grid with the caption 'Loading Grid...' We have attempted to fix this issue by updating the 'Trusted Sites' list and changing the security settings according to KB818046. However, nothing seems to definitely fix the problem. Also, when the problem randomly fixes itself, it still occurs when viewing specific projects. Any ideas on a fix?

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• monitoring a /21 for potential bad guys with snort and port mirroring

  - by Adeodatus

  Hi all, I want/need to start monitoring our network a bit better. Its an odd network in that it comprises 2 /22 public IPs and a slew of private admin IPs. I do have one point in the network where it all comes together and I can turn on port mirroring on the catalyst. From that port, I'd like to turn up a box running various utilities. Snort is high on my list but it'd be nice to also get some networking statistics with something like Netflow. So, what are peoeple's thoughts. I can turn up a box needed for this with a bit of ease. We have the hardware available. What should I run? I'd love to know what kind of nasty things are potentially going on but I'd also like to see statistics on what people are doing on the network so I can better tweak our systems to handle it better and improve performance. I'm open so please, give me some ideas to go along with what I've got.

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• Exchange 2007 CCR: Logs not replicating to passive node partition

  - by yum_tacos4u

  In my environment I have setup Exchange 2007 in an CCR cluster, mirroring our main servers to a set of servers in passive mode. One of the partitions on the passive node that I have setup for the logs for Exchange 2007 has faulted, causing the partition to be unreadable. I have replaced the partition on the passive node, and setup the drive to mirror the one in active mode, but the logs are not replicating since the change. Is there anyway to force the replication of the new drive for the logs to the new partition? Any idea why the logs are not replicating? Any help or comments is appreciated, and thanks in advance.

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• WebDAV through Apache2 permissions/missing files

  - by Strifariz

  I have a WebDAV setup on Apache2 on a server running Debian 5.0 (Lenny), which I am accessing through a mapped network drive under Windows 7. The setup appears to run fine, I receive no permission errors when copying a file to the share the first time, but the file never shows up in the directory (it's invisible, doing a ls -lha on the directory as root on the server also shows no files. When attempting to copy the file once more I am informed that the file already exists though, and I am asked if I wish to overwrite the file, when selecting "Yes" to this, I receive a permission error saying I'm not able to write to the folder. My logs aren't reporting any access violations of any kind, what could be the problem? (See log excerpt below) [17/Jan/2011:10:26:34 +0100] "PUT /1.png HTTP/1.1" 401 525 "-" "Microsoft-WebDAV-MiniRedir/6.1.7600" [17/Jan/2011:10:26:34 +0100] "PUT /1.png HTTP/1.1" 201 304 "-" "Microsoft-WebDAV-MiniRedir/6.1.7600" [17/Jan/2011:10:26:34 +0100] "LOCK /1.png HTTP/1.1" 401 525 "-" "Microsoft-WebDAV-MiniRedir/6.1.7600" [17/Jan/2011:10:26:34 +0100] "LOCK /1.png HTTP/1.1" 200 447 "-" "Microsoft-WebDAV-MiniRedir/6.1.7600" [17/Jan/2011:10:26:34 +0100] "PROPPATCH /1.png HTTP/1.1" 401 525 "-" "Microsoft-WebDAV-MiniRedir/6.1.7600" [17/Jan/2011:10:26:34 +0100] "PROPPATCH /1.png HTTP/1.1" 207 389 "-" "Microsoft-WebDAV-MiniRedir/6.1.7600" [17/Jan/2011:10:26:34 +0100] "HEAD /1.png HTTP/1.1" 401 - "-" "Microsoft-WebDAV-MiniRedir/6.1.7600" [17/Jan/2011:10:26:34 +0100] "HEAD /1.png HTTP/1.1" 200 - "-" "Microsoft-WebDAV-MiniRedir/6.1.7600" [17/Jan/2011:10:26:34 +0100] "PUT /1.png HTTP/1.1" 401 525 "-" "Microsoft-WebDAV-MiniRedir/6.1.7600" [17/Jan/2011:10:26:35 +0100] "PUT /1.png HTTP/1.1" 204 - "-" "Microsoft-WebDAV-MiniRedir/6.1.7600" [17/Jan/2011:10:26:35 +0100] "PROPPATCH /1.png HTTP/1.1" 401 525 "-" "Microsoft-WebDAV-MiniRedir/6.1.7600" [17/Jan/2011:10:26:35 +0100] "PROPPATCH /1.png HTTP/1.1" 207 389 "-" "Microsoft-WebDAV-MiniRedir/6.1.7600" [17/Jan/2011:10:26:35 +0100] "UNLOCK /1.png HTTP/1.1" 401 525 "-" "Microsoft-WebDAV-MiniRedir/6.1.7600" [17/Jan/2011:10:26:35 +0100] "UNLOCK /1.png HTTP/1.1" 204 - "-" "Microsoft-WebDAV-MiniRedir/6.1.7600" [17/Jan/2011:10:26:38 +0100] "PROPFIND / HTTP/1.1" 401 525 "-" "Microsoft-WebDAV-MiniRedir/6.1.7600" [17/Jan/2011:10:26:38 +0100] "PROPFIND / HTTP/1.1" 207 1634 "-" "Microsoft-WebDAV-MiniRedir/6.1.7600"

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• Apache 2.4.3 php-fpm mod_fast_cgi and mod_cache

  - by Anjia

  Did anybody successfully configured mod_cache in apache 2.4 with php-fpm and fastcgi? my cgi config: <IfModule mod_fastcgi.c> Alias /php5.fastcgi /var/www/fastcgi/php5.fastcgi AddHandler php-script .php FastCGIExternalServer /var/www/fastcgi/php5.fastcgi -socket /mnt/tmp/fast/php-fpm.sock -idle-timeout 1600 -pass-header Authorization Action php-script /php5.fastcgi virtual My php-fpm config is standard and I am loading mod_cache and mod_disk_cache in Apache. However the Apache does not seems to cache any content. The debug log file: Fri Sep 07 23:22:59.691333 2012] [cache:debug] [pid 35623:tid 123613201929984] mod_cache.c(161): [client 10.0.0.22:21938] AH00750: Adding CACHE_SAVE filter for /index.html [Fri Sep 07 23:22:59.691345 2012] [cache:debug] [pid 35623:tid 123613201929984] mod_cache.c(171): [client 10.0.0.22:21938] AH00751: Adding CACHE_REMOVE_URL filter for /index.html [Fri Sep 07 23:23:01.326598 2012] [cache:debug] [pid 35623:tid 123613185144576] cache_storage.c(626): [client 10.0.0.110:5414] AH00698: cache: Key for entity /index.html?(null) is `http://10.0.1.16:8080/index.html?`

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• Amazon ec2 - WildCard Sub-Domain

  - by Sharanc25

  I'm running an ec2 instance on ubuntu running lamp stack. I configured my httpd.conf file to support wildcard sub-domain but it didn't work. My httpd.conf file NameVirtualHost * <VirtualHost *> DocumentRoot /www/example ServerName example.com ServerAlias *.example.com </VirtualHost> I tried all possible solutions but they didn't work. Finally I used amazon Route-53 to setup a wildcard DNS to redirect all *.example.com to example.com. My question is, Is it okay if I use Route-53 instead of httpd.conf file for wildcard Sub-Domain ? Is there an error in my httpd.conf file ? (Note: I used the same httpd.conf settings with another hosting provider and it worked perfectly there.) Additional Information : VirtualHost configuration: wildcard NameVirtualHosts and _default_ servers: *:80 is a NameVirtualHost default server example.com (/etc/apache2/httpd.conf:1) port 80 namevhost example.com (/etc/apache2/httpd.conf:1) port 80 namevhost ip-xx-xxx-xx-xxx.ec2.internal (/etc/apache2/sites-enabled/000-default:1) Syntax OK

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• Solaris 10 zlogin logs in, logs out immediately

  - by Spelevink

  On a SPARC v445 running Solaris 10 9/10, had to rebuild rpool and reattached the three existing mirrored zpools on the other existing disks, with their zfs filesystems and NG zones intact. The zones have been configured with zonecfg -z ZONENAME create etc. ... and are now online using zoneadm -z ZONENAME attach -U then simply booting after being in installed state, but I cannot zlogin to any of the zones except one. It shows that I am logged in, then a blank line, then immediately logged out again. When I try to login using zlogin -C ZONENAME I cannot; the error message is: May 15 15:43:46 <hostname> login: open_module: stat(/usr/lib/security/pam_mkhomedir.so.1) failed: no such file or directory. May 15 15:43:46 <hostname> login: load_modules: cannot open module /usr/lib/security/pam_mkhomedir.so.1 But /usr/lib/pam_mkhomedir.so.1 does not exist, and it does not exist on my other servers, but those zones are accessible using zlogin. I can only zlogin to the zones with zlogin -S ZONENAME. What to do next? Thank you.

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• FTPS SSH Host Key after IP Address Change

  - by David George

  I have a Secure FTP (FTPS) server that my remote sites to upload files to daily via scripted routines that run. I have had issues in the past when upgrading hardware and deploying new servers causing the RSA Fingerprint to change for that server. Then all my remote sites can't connect until I have the old key removed (usually via ssh_keygen -r myserver.com). I now have to change the IP address for myserver.com and I wondered if there is anyway to proactively generate new host keys so that when the server address changes all my FTPS client remote sites don't break?

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• How can I filter packets from a port monitor?

  - by engineerchuan

  I have some data going from Point A to Point B. I have a SPAN monitor set up to a monitoring device C. To recreate some real world scenarios, I want to filter out all traffic which is a certain type (H.323 VoIP Signaling Packets) so that C sees a subset of the information that is flowing from A to B. What would the easiest way to do this be? I assume I would need a computer with 2 NIC cards and some software to examine each packet and chuck out the H.323 VoIP packets? Thanks!

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• Software for failover across multiple external hosts

  - by Lin

  I have multiple webservers with the same content, hosted across different providers. However, I can't seem to find a nice, simple failover solution. Load-balancing software (Pound, HAProxy, etc.) are unnecessary, and I need the flexibility to manage over 100+ domains, so the paid DNS failover solutions I've found are too expensive. So far the simplest solution I've thought of is just to set a very low TTL (30min - 1hr) in each zone entry on my nameservers (running BIND). Then, continuously monitor each server, and temporarily remove failed servers from zone entries. But this seems like something that should be currently available. I only have root access to different VPSes running CentOS. Any suggestions? Thanks!

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• Issues resolving DNS entries for multi-homed servers

  - by I.T. Support

  This is difficult to explain, so bear with me. We have 2 domain controllers, each multi-homed to straddle 2 internal subnets, (subnet A and subnet B) and provide dns, dhcp, and ldap authentication. Both domain controllers each have 2 DNS entries. both entries have identical host names, but correspond to subnet A & subnet B respectively (example entries shown): dc1 host 192.168.8.1 dc1 host 192.168.9.1 dc2 host 192.168.8.2 dc2 host 192.168.9.2 We also have a 3rd subnet for our dmz, (subnet C) which neither domain controller has an IP address on, but our firewall/routing tables provide access to subnet A from subnet C and vice versa, but don't allow access to subnet B from subnet C. Here's my issue. How can I force/determine which dns entry is used when a server on subnet C queries either domain controller by host name? Right now it seems to randomly pick one of the two entries, swaps out the name for the IP address and that's that. The problem is if it randomly selects the entry that corresponds to the 9.x subnet B (no access from subnet C), then the server fails to resolve. If it picks the entry for the 8.x subnet A then it resolves (firewall/routing tables defined for communication between these 2 subnets) Here's what I'd like to know: What are Best Practices (if any) for dealing with DNS resolution on subnets that the DNS servers don't have a presence on? Can I control something akin to a metric value to force an order of DNS resolution when there are multiple entries for the same host name that correspond to different IP subnets? Should I even have 2 DNS HOST entries for the same name? Here's what I'd like to avoid: Making edits to the HOSTS files of servers on subnet C to force DNS resolution of the hostname to the appropriate subnet Adding NIC's to the DC's to have them straddle the DMZ as well, thus obtaining a third DNS entry that corresponds to subnet C Again, my apologies if this was too verbose / unclear. Thanks!

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• IIS7.5 Outbound Rule for lower case URLs in <a href="...">

  - by Quog

  Hi, I know how to canonicalise the case of URLs on incoming request to IIS7.5, in fact, there's a built in rule template to start from. But how about outbound (without changing the code)? This is where I got to so far: <outboundRules> <rule name="Outbound lowercase" preCondition="IsHTML" enabled="true"> <match filterByTags="A" pattern="[A-Z]" ignoreCase="false" /> <action type="Rewrite" value="{ToLower:{R:0}}" /> </rule> <preConditions> <preCondition name="IsHTML"> <add input="{RESPONSE_CONTENT_TYPE}" pattern="^text/html" /> </preCondition> </preConditions> </outboundRules> However, IIS barfs on the action with a 500 implying an invalid web.config, probably on the {ToLower:XXXX} which I stole from the MS-supplied inbound rule template. Anyone know how to do this? Anyone know where the options are fully documented (my GoogleNinja skills failed me: I found this but "Specifies value syntax for the rule. This element is available only for the Rewrite action type" is not really comprehensive). Thanks, Damian

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• Virtualbox HTTP load testing, host CPU overload issues

  - by aschuler

  I'm doing HTTP load testing benchmarks (using Apache Benchmark and Siege) on a small Java EE 1.7.0 / Tomcat 7.0.26 application running on a Debian Squeeze 6.0.4 x64 virtualized with Virtualbox 4.1.8. The computer host is Ubuntu 11.10 x64. I've modified those parameters in the Tomcat server.xml : <Connector port="8080" protocol="HTTP/1.1" connectionTimeout="200000" redirectPort="8443" acceptCount="2000" maxThreads="150" minSpareThreads="50" /> The application executed on the server takes around 300ms. This app is running well until a certain amount of concurrent connections like those one : ab -n 500 -c 150 http://xx.xx.xx.xx:8080/myapp/ ab -n 1000 -c 50 http://xx.xx.xx.xx:8080/myapp/ siege -b -c 100 -r 20 http://xx.xx.xx.xx:8080/myapp/ A lot of socket connection timed out happens and this completly overload the host processor (but the CPU load inside the VM is normal). Doing an htop on the host, i can see that the Virtualbox processus is running under 300% CPU and never come down even after the load test is finished. (I've allocated 4 processors to the VM, if I allocate only one processor, CPU load goes under 100%). Restarting Tomcat don't do anything, i'm forced to restart the whole VM. I've tryed to launch those ab/siege commands locally on the VM and everything goes well. I first thought it was related to a linux network limit as explained here: Running some benchmarks using ab, and tomcat starts to really slow down So I've modified those TCP parameters : echo 15 > /proc/sys/net/ipv4/tcp_fin_timeout echo 30 > /proc/sys/net/ipv4/tcp_keepalive_intvl echo 1 > /proc/sys/net/ipv4/tcp_tw_recycle echo 1 > /proc/sys/net/ipv4/tcp_tw_reuse It seems to be better, but it continues to overload the host CPU and output socket connections time out at a certain amount of concurrent connections. I'm wondering if this is not related to how Virtualbox handles external concurrent connections.

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• How do I get a hold of the Reply-To header and remunge it in postfix

  - by Mikhail

  I have a legacy application that emails via php. 5% of the emails aren't going through. The solution is to route all email through a fancy verified mail server like Amazon's SES. I am having some trouble implementing this functionality. It seems this guy had a similar problem. My question is where in postfix can I set a filter that will take as input the the message headers, so that I can manually set the From field and the Reply-To field to [email protected] and [email protected], respectively. Where whatever_php_wants is dictated by the php program and the users registration email. I know where to set the noreply portion, but I don't know the exact place in postfix's configuration files where I can intercept complete emails and pass them to a script. Edit So I want emails to look like: FROM: [email protected] REPLY-TO: the_users_address@their_email_service.com

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• network issue ubuntu 8.04 in vmware esx

  - by hoberion

  ok, this is really pissing me off I have one ubuntu 8.04 instance running on vmware (esx) which decided after a reboot to stop resolving dns requests, I also cant connect to it using ssh although I can ping the server and its really that server (when I shutdown the server the ping also stops) stuff I tried: - reboot again :) - nslookup - serverip - setting networking to dhcp - offering some cute kittens to lucifer - removing the virtual nic and adding another (to get a different mac) - migrating the instance to another esx host - drinking 20 cups of espresso - stopped all services - running dnsmasq on another server and connecting to that dns - tcpdumping - disabling ip6 symptoms: cant resolve anything nslookup just says "no servers found..." although I can ping the servers traceroute to gateway doesnt work (even with traceroute -4 -n gatewayip) collegues laughing at me any thoughts

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• How can i remove some installed python modules in centos

  - by user1513613

  I am getting ths error Python 2.7.5 (default, Jul 2 2013, 13:33:13) [GCC 4.4.7 20120313 (Red Hat 4.4.7-3)] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>> import MySQLdb Traceback (most recent call last): File "<stdin>", line 1, in <module> File "MySQLdb/__init__.py", line 23, in <module> (version_info, _mysql.version_info)) ImportError: this is MySQLdb version (1, 2, 4, 'final', 1), but _mysql is version (1, 2, 3, 'final', 0) >>> Now i dont know how i have installed that. i treid so many things like yum , pip easy, install etc. how can i remove all versions of MysqlDB FROM THERE

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• Wifi Drops Connections with WPA2-PSK

  - by graf_ignotiev

  I run a small computer lab made up of 10 computers of identical hardware and software (Dell Latitudes with Windows 7 x64 Enterprise) and I use a ZyWALL 2WG as a router/firewall. Nine of the computers connect to the router over wifi using WPA2-PSK encryption while the last one is connected by ethernet cable. I'm having a problem where any computer connected to the wi-fi occasionally drops off the network (it cannot be pinged and the client cannot ping the gateway). It only happens on the wifi side and only when the encryption is WPA2-PSK or WPA-PSK. I tried using another router with a different make and model and had no problems. Thinking it could be a software error, I reset the router to factory defaults and installed the newest firmware (V4.04(AQI.8) | 04/09/2010), but still have the problem. The 802.1X log gives the following error User logout because of user disassociation. with this note WPA2-PSK:00242c582ece:logout where 00242c582ece is the mac address of the device. At this point I'm out of things to try and leads to follow. It looks like this user had the same or similar problem, but none of those proposed solutions work for me.

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• Sharepoint 2007 Event ID 6482

  - by Dave M

  Our two server SharePoint 2007 SP2 farm has an issue. Event ID 6482 appears in the Application log of the Web front end many times a day. Often many time a minute. The full error is from Office SharePoint Server Event Type: Error Event Source: Office SharePoint Server Event Category: Office Server Shared Services Event ID: 6482 Date: 11/12/2009 Time: 3:05:22 PM User: N/A Computer: XXXXXX Description: Application Server Administration job failed for service instance Microsoft.Office.Server.Search.Administration.SearchServiceInstance (36a9b7ef-59aa-4f94-8887-8bf7b56f2f91). Reason: Error during encryption or decryption. System error code 0. Techinal Support Details: System.ArgumentException: Error during encryption or decryption. System error code 0. at Microsoft.Office.Server.Search.Administration.SearchServiceInstance.SynchronizeDefaultContentSource(IDictionary applications) at Microsoft.Office.Server.Search.Administration.SearchServiceInstance.Synchronize() at Microsoft.Office.Server.Administration.ApplicationServerJob.ProvisionLocalSharedServiceInstances(Boolean isAdministrationServiceJob) For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. The SharePoint site appears to be functioning normally and Search returns expected results. Any suggestions would be appreciated

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