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• Intermittent "Lost connection to MySQL server at 'reading initial communication packet'"

  - by db2

  Our web environment consists of two servers. Web front-end. Dell PowerEdge R610, RHEL 5.5, Apache 2.2.17, php 5.2.14. Database server. Dell PowerEdge R710, Windows 2008 R2 Standard x64, MySQL 5.5.11-log x64. Normally these two work perfectly fine together. However, when I try to get them talking via a dedicated LAN on their secondary NICs (each machine has four of them), things get flaky. I have NIC #2 on both machines configured on the 172.16.1.0/24 subnet, with no gateway or DNS servers (obviously, since it's just those two systems), and I put the private IP address of each machine into the hosts file of the other. The routing tables on both machines look okay after I do this. I've tried this with both a crossover cable draped directly between the two NICs, and also via a dedicated vlan on the switch in the rack. In either case, I get intermittent connection problems. It's a fairly small percentage of connections that fail, but it's enough to cause a significant problem, and I have to switch back to the main network connection, which will contend with all the other traffic and hosts on the switch. The full error message that appears in the application log: SQLSTATE[HY000] [2013] Lost connection to MySQL server at 'reading initial communication packet', system error: 110 Am I doing something really dumb that's causing this to not work properly? Anything I can check in MySQL that would explain why it's failing to connect occasionally?

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• SSH dynamic port forwarding, "Connection refused"

  - by crodjer

  I am trying to do dynamic portforwarding using openssh through a remote computer following this command: ssh -D 6789 rohan@<remote_ip> -p <remote_port> This should set up a socks server on my comp as I assume. I am able to use this for normal browsing but can't connect to IRC or remote ssh (through proxychains). I get this error: channel 3: open failed: connect failed: Connection refused A high verbosity level output of the error: $ debug1: Connection to port 6789 forwarding to socks port 0 requested. debug2: fd 9 setting TCP_NODELAY debug2: fd 9 setting O_NONBLOCK debug3: fd 9 is O_NONBLOCK debug1: channel 3: new [dynamic-tcpip] debug2: channel 3: pre_dynamic: have 0 debug2: channel 3: pre_dynamic: have 4 debug2: channel 3: decode socks5 debug2: channel 3: socks5 auth done debug2: channel 3: pre_dynamic: need more debug2: channel 3: pre_dynamic: have 0 debug2: channel 3: pre_dynamic: have 10 debug2: channel 3: decode socks5 debug2: channel 3: socks5 post auth debug2: channel 3: dynamic request: socks5 host 4.2.2.2 port 53 command 1 debug3: Wrote 96 bytes for a total of 3335 channel 3: open failed: connect failed: Connection refused debug2: channel 3: zombie debug2: channel 3: garbage collecting debug1: channel 3: free: direct-tcpip: listening port 6789 for 4.2.2.2 port 53, connect from 127.0.0.1 port 33694, nchannels 4 debug3: channel 3: status: The following connections are open: #2 client-session (t4 r0 i0/0 o0/0 fd 6/7 cfd -1) debug3: channel 3: close_fds r 9 w 9 e -1 c -1 I googled for this too, but couldn't find any solutions.

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• Munin node not listing any plugins on new Fedora 14 installation

  - by Dave Forgac

  I have just installed munin-node from the base repo on Fedora 14 and then started it. I found that my munin server is not able to collect data from this node so I tried connecting via telnet to test. When connecting via telnet I see that no plugins are listed: [dave@host ~]# telnet localhost 4949 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. # munin node at host.example.com list quit Connection closed by foreign host. [dave@host ~]# I did not modify anything after the installation. The munin-node.conf is allowing connections from 127.0.0.1 and the default set of plugins in /etc/munin/plugins/ are symlinked to the plugins in /usr/share/munin/plugins/. Here is the working output of the telnet test of the 'list' command should look like (this is on a Fedora 13 host): [dave@www ~]$ telnet localhost 4949 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. # munin node at www.example.com list apache_accesses apache_processes apache_volume cpu df df_inode entropy forks fw_packets if_err_eth0 if_err_eth1 if_eth0 if_eth1 interrupts iostat iostat_ios irqstats load memory munin_stats mysql_ mysql_bytes mysql_innodb mysql_queries mysql_slowqueries mysql_threads netstat open_files open_inodes postfix_mailqueue postfix_mailvolume proc_pri processes swap threads uptime users vmstat yum quit Connection closed by foreign host. [dave@www ~]$ Edited to show output of munin-node-configure: [root@host ~]# munin-node-configure Plugin | Used | Extra information ------ | ---- | ----------------- acpi | no | amavis | no | ... http_loadtime | no | if_ | yes | eth1 eth0 if_err_ | yes | eth0 eth1 ifx_concurrent_sessions_ | no | interrupts | yes | ... uptime | yes | users | yes | varnish_ | no | vserver_resources | no | yum | yes | zimbra_ | no | Any suggestions on what to check next?

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• Slow transfer speed between two servers

  - by Linux Guy

  I have two servers both network cards speed is 10Gbps The inbound bandwidth between two servers is 10Gbps , the outbound bandwidth internet bandwidth is 500Mpbs Both servers using public ip addresses in public and private network Both servers transfer and connection on nginx port , and the server B used for streaming media , like youtube stream videos I check the transfer speed using iperf utility From Server A to Server B # iperf -c 0.0.0.1 -p 8777 ------------------------------------------------------------ Client connecting to 0.0.0.1, TCP port 8777 TCP window size: 85.3 KByte (default) ------------------------------------------------------------ [ 3] local 0.0.0.0 port 38895 connected with 0.0.0.1 port 8777 [ ID] Interval Transfer Bandwidth [ 3] 0.0-10.8 sec 528 KBytes 399 Kbits/sec My Current Connections in Server B # netstat -an|grep ":8777"|awk '/tcp/ {print $6}'|sort -nr| uniq -c 2072 TIME_WAIT 28 SYN_RECV 1 LISTEN 189 LAST_ACK 139 FIN_WAIT2 373 FIN_WAIT1 3381 ESTABLISHED 34 CLOSING Server A Network Card Information Settings for eth0: Supported ports: [ TP ] Supported link modes: 100baseT/Full 1000baseT/Full 10000baseT/Full Supported pause frame use: No Supports auto-negotiation: Yes Advertised link modes: 10000baseT/Full Advertised pause frame use: No Advertised auto-negotiation: Yes Speed: 10000Mb/s Duplex: Full Port: Twisted Pair PHYAD: 0 Transceiver: external Auto-negotiation: on MDI-X: Unknown Supports Wake-on: d Wake-on: d Current message level: 0x00000007 (7) drv probe link Link detected: yes Server B Network Card Information Settings for eth2: Supported ports: [ FIBRE ] Supported link modes: 10000baseT/Full Supported pause frame use: No Supports auto-negotiation: No Advertised link modes: 10000baseT/Full Advertised pause frame use: No Advertised auto-negotiation: No Speed: 10000Mb/s Duplex: Full Port: Direct Attach Copper PHYAD: 0 Transceiver: external Auto-negotiation: off Supports Wake-on: d Wake-on: d Current message level: 0x00000007 (7) drv probe link Link detected: yes The problem is : as you can see from iperf utility, the transfer speed from server A to server B slow when i restart network service the connection will be ok , after 2 minutes , it's getting slow How could i troubleshoot slow speed issue and fix it in server B ? Notice : if there any other commands i should execute in servers for more information, so it might help resolve the problem , let me know in comments

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• Why can I not access the internet when Windows 7 finds no issue with the ethernet connection and the network can see my device?

  - by WannabeCoder

  So I just moved from a house to an apartment. In the house and the apartment I had Uverse set up - and in both I had my desktop connected via a ~40 foot long cat5 cable. However, upon moving to the apartment I found that my ethernet connection no longer provides internet. This would seem like a mundane problem if not for: The router can see the computer on the network Windows 7 (the desktop's OS) detects no problems with the ethernet connection. Connections over the internet (i.e. browser windows, Pandora, etc.) do not immediately fail. Instead they load for 2 minutes and then finally give up. Devices connected over the Wifi (PS4, Laptop) access the internet just fine While removing the cat5 cable from my house, I accidentally damaged the locking tab but managed to bend it back into the appropriate position. I would suspect that a bad cat5 cable might be to blame if not for the above issues (thought I've heard bad cat5 cables cause the most nonsensical problems) and the fact that I tested the cat5 cable by having it share internet between my laptop (working internet) to my desktop and it functioned just fine and provided the desktop with internet. My ipconfig /all successfully finds a default gateway, DHCP server, and DNS server. What could possibly be causing the problem?

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• General logging won't work in MySQL

  - by leonstr

  I saw on SF that there's an option in MySQL to log all queries. So, in my version (mysql-server-5.0.45-7.el5 on CentOS 5.2) this appears to be a case of enabling the 'log' option, so I edited /etc/my.cnf to add this: [mysqld] datadir=/var/lib/mysql socket=/var/lib/mysql/mysql.sock user=mysql old_passwords= log=/var/log/mysql-general.log [mysqld_safe] log-error=/var/log/mysqld.log pid-file=/var/run/mysqld/mysqld.pid I then created the file and set permissions: # touch /var/log/mysql-general.log # chown mysql. /var/log/mysql-general.log # ls -l /var/log/mysql-general.log -rw-r--r-- 1 mysql mysql 0 Jan 18 15:22 /var/log/mysql-general.log But when I start mysqld I get: 120118 15:24:18 mysqld started ^G/usr/libexec/mysqld: File '/var/log/mysql-general.log' not found (Errcode: 13) 120118 15:24:18 [ERROR] Could not use /var/log/mysql-general.log for logging (error 13). Turning logging off for the whole duration of the MySQL server process. To turn it on again: fix the cause, shutdown the MySQL server and restart it. 120118 15:24:18 InnoDB: Started; log sequence number 0 182917764 120118 15:24:18 [Note] /usr/libexec/mysqld: ready for connections. Can anyone suggest why this isn't working?

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• Squid, authentication, Outlook Anywhere, Windows 7 and HTTP 1.1 = NIGHTMARE

  - by Massimo

  I'm running a Squid proxy (latest version, 3.1.4) on Linux CentOS 5.4 with Samba 3.5.4, in order to allow authenticated web access for domain users; everything works fine, and even Windows 7 clients are fully supported. Authentication is transparent for domain users, while it is explicitly requested for non-domain ones, and it works if the user can provide valid domain credentials. All nice and good. Then, Outlook Anywhere kicks in and pain and suffering ensue. When Outlook (be it 2007 or 2010, it doesn't matter) runs on Windows XP clients, it connects gracefully through the Squid proxy to its remote Exchange server. When it runs on Windows 7, it doesn't. If the authentication requirement is lifted from the proxy, everything works on Windows 7 too, so the problem is obviously related to NTLM authentication with Squid. Digging more deeply (WireShark), I discovered Outlook Anywhere uses HTTP 1.1 when it runs on Windows 7, while it uses HTTP 1.0 when on Windows XP. And it looks like Squid, even in its latest incarnation, still has some serious troubles handling HTTP 1.1 properly, particularly when SSL and proxy authentication are thrown in the mix. While waiting for Squid to fully and officially support HTTP 1.1 (and it looks like this could take quite a long time), I'm looking for one of the following solutions: Make Squid handle this correctly, if it is at all possible. Identify Outlook Anywhere connections and have Squid not require authentication for them. But it isn't easy: again, the behaviour of Outlook differs when running on Windows XP and Windows 7, and while on Windows XP Outlook sends a really nice user-agent string of "MSRPC", on Windows 7 it doesn't send any (why? WHY?!?). Force Outlook Anywhere to use HTTP 1.0 even when running on Windows 7. And no, this is not as simple as deselecting "use HTTP 1.1" in Internet Explorer, looks like Outlook ignores that setting and chooses on its own which protocol to use. Any other feasible solution which doesn't involve whitelisting specific destination Exchange servers, which is the last-resort solution I'm trying to avoid.

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• Requiring SSH-key Login From Specific IP Ranges

  - by Sean M

  I need to be able to access my server (Ubuntu 8.04 LTS) from remote sites, but I'd like to worry a bit less about password complexity. Thus, I'd like to require that SSH keys be used for login instead of name/password. However, I still have a lot to learn about security, and having already badly broken a test box when I was trying to set this up, I'm acutely aware of the chance of screwing myself while trying to accomplish this. So I have a second goal: I'd like to require that certain IP ranges (e.g. 10.0.0.0/8) may log in with name/password, but everyone else must use an SSH key to log in. How can I satisfy both of these goals? There already exists a very similar question here, but I can't quite figure out how to get to what I want from that information. Current tactic: reading through the PAM documentation (pam_access looks promising) and looking at /etc/ssh/sshd_config. Edit: Alternatively, is there a way to specify that certain users must authenticate with SSH keys, and others may authenticate with name/password? Solution that's currently working: # Globally deny logon via password, only allow SSH-key login. PasswordAuthentication no # But allow connections from the LAN to use passwords. Match Address 192.168.*.* PasswordAuthentication yes The Match Address block can also usefully be a Match User block, answering my secondary question. For now I'm just chalking the failure to parse CIDR addresses up to a quirk of my install, and resolving to try again when I go to Ubuntu 10.04 not too long from now. PAM turns out not to be necessary.

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• Windows 7: Windows Firewall: Logging/Notifying on Outgoing Request Attempts

  - by Maxim Z.

  I'm trying to configure Windows Firewall with Advanced Security to log and tell me when programs are trying to make outbound requests. I previously tried installing ZoneAlarm, which worked wonders for me with this in XP, but now, I'm unable to install ZA on Win7. My question is, is it possible to somehow monitor a log or get notifications when a program tries to do that if I set all outbound connections to auto-block, so that I can then create a specific rule for the program and block it.? Thanks! UPDATE: I've enabled all the logging options available through the Properties windows of the Windows Firewall with Advanced Security Console, but I am only seeing logs in the %systemroot%\system32\LogFiles\Firewall\pfirewall.log file, not in the Event Viewer, as the first answer suggested. However, the logs that I can see only tell me the request's or response's destination IP and whether the connection was allowed or blocked, but it doesn't tell me what executable it comes from. I want to find out the file path of the executable that each blocked request comes from. So far, I haven't been able to.

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• How much network latency is "typical" for east - west coast USA?

  - by Jeff Atwood

  At the moment we're trying to decide whether to move our datacenter from the west coast to the east coast. However, I am seeing some disturbing latency numbers from my west coast location to the east coast. Here's a sample result, retrieving a small .png logo file in Google Chrome and using the dev tools to see how long the request takes: West coast to east coast: 215 ms latency, 46 ms transfer time, 261 ms total West coast to west coast: 114 ms latency, 41 ms transfer time, 155 ms total It makes sense that Corvallis, OR is geographically closer to my location in Berkeley, CA so I expect the connection to be a bit faster.. but I'm seeing an increase in latency of +100ms when I perform the same test to the NYC server. That seems .. excessive to me. Particularly since the time spent transferring the actual data only increased 10%, yet the latency increased 100%! That feels... wrong... to me. I found a few links here that were helpful (through Google no less!) ... Does routing distance affect performance significantly? How does geography affect network latency? Latency in Internet connections from Europe to USA ... but nothing authoritative. So, is this normal? It doesn't feel normal. What is the "typical" latency I should expect when moving network packets from the east coast <--> west coast of the USA?

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• Windows 7, network connection with no default gateway: any way to change the "Unknown network" statu

  - by e-t172

  Hi, I have a computer running Windows 7 Pro RTM. This computer has two network connections: A Wi-fi connection to the Internet (through a home router) which works just fine. An OpenVPN virtual network connection. More precisely, this is a virtual Ethernet connection which behaves exactly like a physical Ethernet wired connection. My problem is that the "Network and sharing center" shows "Unknown network" for the OpenVPN connection. After some research I found that logical networks (outside a domain) are identified by the MAC address of the default gateway of the connection. Problem is, the OpenVPN connection has no default gateway: it is a private network, so I don't need one... Consequently, the "Unknown network" is always considered public, so the firewall is always in "public mode", which I don't want. Plus, I can't rename "Unknown connection" or anything (which makes sense), so it is kinda ugly. My goal is to define a proper logical network for the OpenVPN connection with the private profile. I know of some workarounds (disable the firewall, modify security policy to make all unknown networks "private") but they're still workarounds. I just want my clients to connect to the VPN without having to disable their firewall settings, without changing global configuration with potential side-effects (the "security policy" solution) and without having to look at an ugly "Unknown connection" in the Network and sharing center. Is there any way I can do this? I tried to check what was going on in the registry (HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\NetworkList is interesting), but I still didn't find a way to "force" the OpenVPN connection to be assigned to a logical network. Any help would be very appreciated. A related question showed up at Superuser: http://superuser.com/questions/37355/windows-7-cant-identify-network/37422

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• sorry, the maximum allowed clients from your host (10) are already connected" FTP error

  - by Sejanus

  Hello, I keep getting the "sorry, the maximum allowed clients from your host (10) are already connected" error whenever I try to transfer a large number of files. At first I thought it's a filezilla bug, however I get the same error basically with every FTP client I've tried, including Total Commander under Wine. I do not get that error using Windows. I did try to limit maximum allowed connections for Filezilla, both in server settings and in global settings, it didnt change anything. I did try to switch between passive and active modes (not sure if it's related at all, just last desperate attempt), and it didnt change anything either. When I try to use native ftp client (not sure how is it called, the one in Places - Connect to a server) I get abstract "connection refused" error every time I transfer large number of files. Connection is refused for separate particular files, if I click "Ignore" each time the rest of files are transfered perfectly well, so I assume it's the very same error. Anything I could do? This really drives me mad, transfering large numbers of files is a part of my everyday job... P.S. and this happens with many different FTP servers. Also I dont get this error in Windows. So I assume it's not a server problem. P.P.S. I am aware of similar question here, the answer provided just didn't solve it to me.

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• 1000Base-X layer 2/MAC address details

  - by user69971

  A layer 2 Ethernet frame is sent with a source and destination MAC address. Given a 100Base-TX (copper) trunk between two Cisco switches, I can do a "show interface fa 0/0" on S1 to see the MAC address assigned to the trunking interface, then go to Switch2 and do a "show mac address-table" and find the MAC address of the S1 fa 0/0 interface as a dynamically learned MAC in the table. Given a similar setup with a 1000Base-X (fiber GBIC) trunk, the MAC address shown in "show interface gi 0/0" on S1 does not show up in the MAC address-table of S2. Everything I can find online indicates that 1000Base-X uses largely the same layer 2 format as copper connections. There's some slight alterations - minimum frame size is slightly larger - but the fundamentals of the frame structure appear to be the same, including transmission with a source and destination L2 address. Why doesn't the address of gi 0/0 show up in the MAC address table of the connection switch? The only thing which seems to make sense would be that the GBIC has its own MAC address, almost as if its acting as a mini 2-port switch or hub, with the switch-assigned MAC address showing up on the interface connection and a different MAC address assigned to the fiber side. If this is the case, is there any way to see the GBIC MAC address on the switch? (I've tried to look up the details in IEEE 802.3z but it doesn't seem to be available without an IEEE membership or purchasing the standard. I find the base 802.3 PDFs for download, but not 802.3z.)

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• special case ssh connection lag

  - by Hersheezy

  Setup We have a DMZ and LAN in our office that are connected to the outside with the following setup: +------+ | |------> LAN (normal office router) |Modem | | |------> DMZ (a single machine) +------+ Our internet account is with Comcast and we have 5 status IPs, one of which points to the single machine in the DMZ. Problem ssh connections initiated ANYWHERE EXCEPT the office LAN are really fast. However, from the LAN, there is about a 5 second delay. WTF?? Extra info The DMZ machine is debian 5. Executing a wget to the DMZ has no lag. When executing the following, everything up to HERE IS WHERE THE LAG IS INCURRED executes immediately. ssh -vvvv [email protected] ... debug2: set_newkeys: mode 1 debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug3: Wrote 16 bytes for a total of 1015 debug2: set_newkeys: mode 0 debug1: SSH2_MSG_NEWKEYS received debug1: SSH2_MSG_SERVICE_REQUEST sent debug3: Wrote 48 bytes for a total of 1063 debug2: service_accept: ssh-userauth debug1: SSH2_MSG_SERVICE_ACCEPT received debug2: key: /home/shopkins/.ssh/id_rsa (0x22440830) debug2: key: /home/shopkins/.ssh/identity ((nil)) debug2: key: /home/shopkins/.ssh/id_dsa ((nil)) debug3: Wrote 64 bytes for a total of 1127` HERE IS WHERE THE LAG IS INCURRED debug1: Authentications that can continue: publickey,password debug3: start over, passed a different list publickey,password debug3: preferred gssapi-keyex,gssapi-with-mic,gssapi,publickey,keyboard-interactive,password debug3: authmethod_lookup publickey debug3: remaining preferred: keyboard-interactive,password debug3: authmethod_is_enabled publickey debug1: Next authentication method: publickey debug1: Offering public key: /home/shopkins/.ssh/id_rsa debug3: send_pubkey_test debug2: we sent a publickey packet, wait for reply debug3: Wrote 368 bytes for a total of 1495 debug1: Authentications that can continue: publickey,password debug1: Trying private key: /home/shopkins/.ssh/identity debug3: no such identity: /home/shopkins/.ssh/identity debug1: Trying private key: /home/shopkins/.ssh/id_dsa debug3: no such identity: /home/shopkins/.ssh/id_dsa debug2: we did not send a packet, disable method debug3: authmethod_lookup password debug3: remaining preferred: ,password debug3: authmethod_is_enabled password debug1: Next authentication method: password [email protected]'s password:

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• How can ICS in Windows 7 be managed via command line, scripts, config files, etc.?

  - by Skya

  I've been using ICS successfully for years, but now I'm looking for a way to control it through something else than the GUI in Control Panel\Network and Internet\Network Connections - Connection Properties: I want to do everything that the encircled checkbox does, without touching the GUI. But what does the checkbox do? Microsoft don't provide specific information and the most helpful forum post I've found is from 2003. Assuming that some of the advice is still valid, I've come to the conclusion that ICS is broken down into 6 parts that have to be set up individually: the sharedAccess service interface settings firewall rules a static route dnsproxy autodhcp I've already learned that the service can be started/stopped with the command net start/stop sharedAccess and that netsh is a good tool for changing the interface settings and the firewall rules. But I don't understand how ICS handles routing and DNS. All hosts in my network are configured statically, so I don't care much about autodhcp. Thanks for your help! EDIT: I've spent the whole day scanning through ProcMon and I've seen reads/writes to both the registry and the filesystem and it is difficult to determine what parts of it actually make ICS work. I'm trying to look for an API instead. I'm looking into this right now, but I still want to know more about the inner workings.

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• Distribute IP packets accross different NIC queues with MSI (Message Signalled Interrupts)

  - by Ansis Atteka

  NetXtreme II BCM5709 Gigabit Ethernet NIC supports MSI feature (Message Signaled Interrupts) and it has 8 queues. Each queue has its own Interrupt handler in /proc/interrupts. What I am trying to accomplish is to tell NIC which packets should go to which queue. Questions: Is it possible to manually specify which IP packets should go to which queue by encapsulated protocol type (e.g. IPsec packets go in one queue, while TCP packets go in another queue)? If it is possible - how can I do it under Linux? If it is not possible - should I look at MSI-X capable NIC cards to solve this problem? More details: We have one Interface that is terminating IPSec and forwarding/terminating TCP connections. The IPSec packet decryption is inlined (this means that decryption is done under the same ksoftirqd/X context). We are trying to find out if we will be able to improve total performance if IPSec packets will be scheduled on another CPU than TCP packets. One more limitation is that IPSec code is not MP-safe, hence I can not run it under more than one ksoftirqd/X. By default it seems that packets are distributed/hashed by source IP over the 8 NIC queues. The bottleneck is IPSec that chokes out TCP traffic while it is decrypting/encrypting IPSec packets at ~100% CPU. OS is Ubuntu 10.10 (2.6.32-27-server) and NIC is Broadcom BCM5709.

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• Server Names Inside Private Network

  - by thyandrecardoso

  Our office has a private network, where any requests on a (pre-determined) public IP are forwarded to a private IP inside said network. On that private IP, we've got a server running several services, including HTTP servers, and SCM systems. We only control our private network, having no control on the public IP configuration. We bought a domain name, and pointed it to that public IP, so people can access our services from the outside. But, when inside the office, people can't use that DNS name, because the server and any other hosts inside the network share the same public IP! For desktops, inside the office network, dealing with names is really easy: one entry on the hosts file and we're done. However, for laptops, that keep going in and out, and need to access services inside the office, the naming is really annoying. I don't know the "standard" process for dealing with these kind of situations. I've considered installing BIND in the office, and make people configure their wireless and wired connections to use that DNS server. What is the correct approach in this situation? If using BIND (or any other DNS server) is the answer, how should I configure it so that people inside the office can use it to get our custom names, and get forwarded to the ISP DNS when trying to reach the internet?

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• Is there any way to detect when nginx has completed a graceful shutdown?

  - by Daniel Vandersluis

  I have a ruby on rails application which is running on passenger and nginx, with one main webserver and multiple application servers. I am trying to update my deployment process in order to minimize (or ideally, remove) any downtime caused by the deployment. The main roadblock right now is that passenger takes some time to restart (ie. reload the application), so in order to get around this, I want to stagger my restarts so that only one app server gets restart at a time. In order to do this without losing any long running passenger processes, I am thinking I need to gracefully shutdown the app server's nginx instance, which will cause it to no longer accept new connections but continue to process the existing ones; as well, HAProxy will detect that the app server is down and route new requests to the other server. However, assuming that there is a long-running process, I am not sure how to detect when the graceful shutdown has completed so that I can start it back up. Since the shutdown is caused by sending a signal (ie. kill -QUIT $( cat /var/run/nginx.pid )), and the kill command will return immediately, I cannot combine commands (ie. kill ... && touch restarted), as the touch command will execute immediately, even if nginx hasn't completed its shutdown. Is there any good way to do this?

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• exim configuration: 503 AUTH command used when not advertised

  - by jrdioko

  I'm running a piece of software on a Windows server that sends email notifications via a remote SMTP server. It has very few configuration options, and only supports basic SMTP authentication without SSL/TLS. I have exim4 running on a Debian server that will be the SMTP server for this Windows program. It is set up with default configuration, plus allowing AUTH PLAIN and AUTH LOGIN unencrypted connections. I have successfully sent an email over telnet: telnet servername 25 ehlo test 250-AUTH PLAIN LOGIN ... auth plain XXX 235 Authentication succeeded mail from: ... ... However, the program I want to connect to this server fails to connect. To see why, I ran a packet sniffer during the connection, and see the following session: C: HELO hostname S: 250 Hello hostname C: AUTH LOGIN XXX | XXX S: 503 AUTH command used when not advertised | 500 unrecognized command C: QUIT S: 221 closing connection I'm not familiar enough with the SMTP protocol to understand what's going on here. What do I need to change on my exim4 SMTP server to allow for this connection to be made?

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• Windows 2003 Active Directory Integrated DNS zone not registering non-domain computers

  - by Jeff Willener

  I'm not a networking guy by all means, I'm just a developer who dabbles enough to get into trouble and I'm there. So bear with me... :) At my office I have a Windows 2003 Domain Controller which also services DNS. On the domain I have a handful of computers and other misc. equipment/toys. For the DNS I only created a Forward Lookup Zone for my domain (mydomain.com). I run a lot of VM's so generally I have everything on the domain, however some of those VM's are not and only in a 'Workgroup'. I also have another laptop which belongs to another domain (otherdomain.com) which is here 100% but I use it for other purposes and has to belong to the otherdomain.com. With all that said, I have two questions: I have found any computer not on mydomain.com does not register it's IP address even though 'Register this connections address in DNS' is set to in the 'Advanced TCP/IP Settings' for the nic. Where have I messed this up? On the laptop which is registered on otherdomain.com, when I do a nslookup for a computer on mydomain.com (e.g. nslookup devbox1) it appends otherdomain.com as the suffix (e.g. queries devbox1.otherdomain.com). Same thing occurs if I use the fully qualified name. In the 'Advanced TCP/IP Settings' for that nic, I can 'Append these DNS suffixes' of mydomain.com but I fear that will hose my DNS lookups when I VPN to otherdomain.com. So what is the correct approach to resolve this issue? Do I add both mydomain.com and otherdomain.com in that order?

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• Issue with InnoDB engine while enabling and [ skip-innodb ] - [ERROR] Plugin 'InnoDB' init function returned error

  - by Ahn

  How to enable InnoDB, which was previously disabled with skip-innodb option. Case 1: Disabled the innodb with skip-innodb option and show engines givens as below. Engine | Support ... | InnoDB | NO ...... Case 2: As I want to enable the innodb, I commanded the #skip-innodb option and restarted. But now the show engines even not showing the InnoDB engine in the list. ? Mysql Version : 5.1.57-community-log OS : CentOS release 5.7 (Final) Log: 120622 13:06:36 InnoDB: Initializing buffer pool, size = 8.0M 120622 13:06:36 InnoDB: Completed initialization of buffer pool InnoDB: No valid checkpoint found. InnoDB: If this error appears when you are creating an InnoDB database, InnoDB: the problem may be that during an earlier attempt you managed InnoDB: to create the InnoDB data files, but log file creation failed. InnoDB: If that is the case, please refer to InnoDB: http://dev.mysql.com/doc/refman/5.1/en/error-creating-innodb.html 120622 13:06:36 [ERROR] Plugin 'InnoDB' init function returned error. 120622 13:06:36 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed. 120622 13:06:36 [Note] Event Scheduler: Loaded 0 events 120622 13:06:36 [Note] /usr/sbin/mysqld: ready for connections. Version: '5.1.57-community-log' socket: '/data/mysqlsnd/mysql.sock1' port: 3307 MySQL Community Server (GPL)

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• Domain authentication over OPEN wireless pre-logon (Windows 7 Pro) - No logon servers avail

  - by Shadow00Caster

  I have a plethora of laptops that are joined to an AD domain. I have an enterprise wireless system setup, the users of these laptops will be using an OPEN unsecured SSID which will ultimately have a captive portal that uses Radius-AD auth and firewall rules to allow access pre-captive portal auth to the proper ip's/ports of DC's etc for auth etc. I already have other laptops/users connecting to another SSID with 802.11x and SSO, all works perfectly pre-logon etc. My problem is with this open network, for some reason I cannot get the machines to auth to AD. The laptops connect to the wireless network, I confirm this on the controller and can ping the laptop at startup. I sharked the wires on the 2 DC's that these machines auth to, I can see a DNS SOA update from a laptop im testing with and can ping that test laptop from both DC's. When I try to logon, "There are currently no logon servers available to service the logon request." The shark shows no incoming connections to either DC even though the laptop is connected and pingable. Any help is greatly appreciated.

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• Rename a Network Printer win Win 7

  - by Alex

  Seems this is a common question but the answers regularly miss the point. I have a server. Server has some printers connected. Server has all drivers for x32 & x64 OS PLUS ALL DEFAULTS set. Server also manages print queue. I have many workstations, all need to use the printers. All NEED to have drivers print queue and DEFAULTS propagated from server. Now.... When I add the printers on the workstations, I get: "ABC Printer on SERVER123" I need something less long - just "ABC Printer" So how? Tip: Please don't show me how to change the name of your locally installed printer. I know how to do this - I am particularly interested in shared printers that look like "ABC Printer on SERVER123" Tip: Installing the driver with a local port wont cut it because then I loose the server propagated defaults, the driver updates and I need to run around with driver disks/confuse trembling users with hard things like choosing drivers. I am happy for a hack if there is no official way to do this in the group policy.... I tried looking in HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Print\Printers on the workstation machines but those are only local printers :( I can see the network printer details on the workstations here: HKEY_USERS[Some GUID]\Printers\Connections But there is nothing obvious like a description string... Can anyone help with this?

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• Cannot establish a network connect to VMWare Fusion VM

  - by twolfe18

  I am running Snow Leopard 10.6.2 (not the server edition) with VMWare Fusion 3.0.0 and I trying to get my Ubuntu 9.10 x86_64 VM working. I am using a bridged connection, and I have an internet connection FROM the Ubuntu VM (I can download updates, ping websites, etc), but I cannot connect TO the Ubuntu box from any other device on my network. I am trying to get Mongrel up on the Ubuntu VM for some Rails stuff, but it's not working. I know Mongrel/Rails is not the problem because if I start the server on the Ubuntu VM, background the process, and then wget the index page, it works. I just cannot connect to the site from another IP. I have tried using a static IP and a DHCP IP configuration on the Ubuntu VM, neither work (for incoming connections, both work for outwards). I have port scanned the Ubuntu VM, and it appears that all ports are closed. However, the Ubuntu VM does respond to pings. I noticed a similar question here: http://serverfault.com/questions/99757/setting-up-a-bridged-network-with-vmware-fusion, but no answer. Any ideas?

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• When I ping Internet addresses like yahoo or Google, I get 2 reply packets and 2 lost packets.

  - by navi

  I have Airtel broadband and a Tata broadband connection. i have around 50 PCs connecting through an airtel broadband connection. Both are dsl connections with my phone line going into dsl modems and an Ethernet cable going from dsl modem directly into a switch. Currently, only airtel connection is connected with static IP on my private lan and using the airtel ISP DNS servers as DNS IP address and the default gateway is 192.168.1.1 (IP add. of the dsl modem). All PCs are connected in a work group. When in full use, my users complain of certain web pages are not opening. When I ping Internet addresses like Yahoo or Google I get 2 reply packets and 2 lost packets. I suspect that a single broadband connection is not able to sustain 50 simultaneous downloads/browsing. Is there any device which connect to both DSL and make one line so that its give me high speed simultaneous browsing. Help needed urgently. Thank you all to those who reply.

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