Ubuntu Networking :: How To Troubleshoot Network Timeout
Jun 2, 2010
My local area network is always time out for few seconds.I have check my memory with "free -m"There are still left 200+ mb left.I am hosting my own ubuntu server, and I share the same internet line with my server and pc. when I access to LAN, I need to type 192.168.2.2, at outside I can access to [URL]It is only the LAN access timeout, but when I access at outside, I didn't face this problem at all.
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Aug 5, 2010
I have a HP P1005, which is connected to my desktop computer. I have it configured using hp-setup and set it to share across the network. However no matter what I do on an other computer connected to the network I'm unable to detect the printer. With OS 11.2 it all worked smoothly and practically out of the box. Only need was to add CUPS as an allowed service. This option is taken out, apparently it posed a security risk beats me if you only allowed local traffic. In order to open up the port I added in the internal and external zone the following: code...
Still the printer is not detected. If I turn the firewall off on both machines, no printer. If I try to ping it from the host machine it asks whether or not I enabled the firewall (which is turned off!!).
cupsd is running on the server printer. Localhost:631 is correctly configured and printing from my desktop works fine.
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Aug 4, 2011
I set the default os to boot as windows 7 with a timeout of 1 second. I thought that this would be enough time to switch os ubuntu when i need to, but I am unable to. How can i reset the timeout to 3 seconds? I also cannot view the ubuntu partition within windows because of ubuntu's file system.
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Jan 31, 2010
Wireless not working. get that to work?
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Apr 1, 2011
A couple of days ago my internet connections suddenly became very slow/intermittant.
I thought the problem was at my DSL provider but after more checking the problem seems to be in Ubuntu/Linux somewhere.
Reason: I can dual boot with windows 7 and have no ptoblem at all. Also I tried a Ubuntu laptop on the same router ethernet port and it also works fine. So its not my hardware or my provider, and its not a general Ubuntu problem either.
There are no error messages in any of the /var/log files and ifconfig looks normal.
It seems to be a DNS problem as it's the initial connection to a host which often times out. If I get a connection, I can e.g. stream an radio station fine.
If I try to e.g. traceroute any host it times out (no reply).
Ubuntu 10.10 is totally up to date as of today.
I'm stuck! How can I troubleshoot this to find the cause?
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Jan 4, 2009
I would like to get my Huawei E169 (aka. Vodafone Mobile Connect K3520, E620 etc.) USB UMTS/3G modem running with my openSUSE 11.1 x86 installation on my MSI Wind U100. The GPRS/UMTS connection works perfectly fine with the stand-alone application Vodafone Mobile Connect for Linux. However, there's the drawback that this app overwrites /etc/resolv.conf (leads to DNS issues if I would like to connect via NetworkManager again) and doesn't disable the off-line mode for Firefox automatically. Consequently, I would like to use NetworkManager for the GPRS/UMTS connection, too.
The NetworkManager configuration dialogue (I'm using the GNOME applet) seems to recognize the plugged USB stick without any issues (I get a radio button for "Huawei E620 USB Modem" in the respective add connection wizard). So I've created the configuration for my provider and saved it. After that I've tried to connect via the applet. However, approx. 2 seconds after I selected the connection, the applet says "Network disconnected" (German: Netzwerkverbindung getrennt) and the stick also obviously doesn't get connected (visible via LED). I created several new connections with different names, replugged the stick, rebooted with and without the stick plugged, but without any success. I also installed the special RPM package which is recommended in Huawei UMTS USB Stick - openSUSE, but - of course - the corresponding 11.1 package. I also used the application manually and got the following result: Looking up for HUAWEI modem and switching modem to BBO 06
[Code]....
Can this time out of the serial command be the reason for the unsuccessful connection? And if yes, how can I force the system to wait longer here? Moreover, I'm wondering, that the GNOME NetworkManager applet doesn't allow me to enter the DNS entries for my GPRS/UMTS connection. Where can I add these entries manually or is that not needed?
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Jul 25, 2011
I have a problem with trying to connect to VPN over linux. From OSX and Windows the VPN connection goes through fine. It was working flawlessly, for the last one month I never used the laptop or the VPN, however after booting recently 1 week ago the VPN always show as timedout. Some details about the vpn / pptp connection details:
[Code]....
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Mar 15, 2010
I have a DSL brodband connection. The internet connectivity was working fine but lately, I am am facing problems while connecting to internet.Upn connecting the cable to the eth0, the /var/log/messages shows repeated instances of:"kernel:corrupted packets received"Also, if i use pppoe-dicovery, I get " Timeout Waiting for PADO packets" error.There is nothing wrong with the cable. If I connect the cable to a windo$s xp laptop, internet connects fine without any problems.Any idea what could be going wrong? Since the internet was working fine earlier on my opensuse box, im not sure what could have gone wrong with the settings.
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May 20, 2010
Something is wrong with the networking on this Ubuntu system. It has been assigned the LAN ip address 10.1.10.10 From another Ubuntu desktop, I can: ssh myself@10.1.10.10 ( from 10.1.10.143 ) and I can login without any problems. I can ping 10.1.10.10 ( from 10.1.10.143 )
[code]...
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Dec 18, 2010
I am experiencing horrible name resolution problems in Maverick. I believe this problem is related to having the following line in nsswitch.conf:hosts: files wins dnsI do use Samba and access windows shares in my network (that's why wins precedes dns. I was wondering if there is any way to setup a wins lookup timeout so it can fail quickly enough to try to perform the lookup using dns.
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Oct 13, 2010
I'm trying to get granular with TCP, one of the answers I can't seem to find is. When a client server connection is lost without closing, how many duplicate ack's are sent until the session is closed. I've kind of figured out the the sender will continue to retransmit a segment for about 9 mins if not Ack'd. going from 1.5,3,6,12,24,48 and the continuing with 64 seconds up to around 9 minutes before is resets the session. but whats happening at the other end.?
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Apr 26, 2011
I have a named server that has forwarders setup. Quite often the dns server where I forward would not respond right away and the query would fail. It would then also cache the empty result for 3 hours and I would need to restart the service or clear the cache. how would I be able to specify a value for forwarders timeout, just like on Windows DNS.
BIND 9.3.6-P1-RedHat-9.3.6-4.P1.el5_5.3
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Nov 26, 2009
I was trying to rsync datas from one server to a remote server. There is a firewall between the two servers and the 22 port is open for the servers.
Attached the error that I got.
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May 27, 2009
I have centos 5.3 server and the problem is the ssh timeout time set to 10 minutes of inactivity. I want to set the timeout to 1 hour, how can I set the timeout time?
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Mar 6, 2010
I'm using Kubuntu 9.10, my pppd version is 2.4.5 and pptp is 1.7.2 I'm trying to connect to the iPredator VPN service, but I keep running into problems with LCP. I've tried using knetworkmanager, nm-applet, kvpnc and plain old text-based configuration to no avail. Here's a snippet of pppd's output:
[Code].....
(I've got "defaultroute" in my /etc/ppp/peers/ipred config file.) Any ideas what could be causing this? Could it even be my router? It claims to support PPTP, but considering it claims a lot of other things which aren't true, I wouldn't be surprised if it was the culprit.
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May 16, 2010
I am using Witopia VPN services and used to work just fine on my Ubuntu 10.04. All of the sudden it stopped working. Here is the log:
Code:
May 17 00:56:58 saeed-laptop NetworkManager: <info> Starting VPN service 'org.freedesktop.NetworkManager.openvpn'...
May 17 00:56:58 saeed-laptop NetworkManager: <info> VPN service 'org.freedesktop.NetworkManager.openvpn' started (org.freedesktop.NetworkManager.openvpn), PID 11477
May 17 00:56:58 saeed-laptop NetworkManager: <info> VPN service 'org.freedesktop.NetworkManager.openvpn' just appeared, activating connections
May 17 00:56:58 saeed-laptop NetworkManager: <info> VPN plugin state changed: 1
May 17 00:56:58 saeed-laptop NetworkManager: <info> VPN plugin state changed: 3
May 17 00:56:58 saeed-laptop NetworkManager: <info> VPN connection 'VPN Connection' (Connect) reply received.
May 17 00:56:58 saeed-laptop nm-openvpn[11482]: OpenVPN 2.1.0 i486-pc-linux-gnu [SSL] [LZO2] [EPOLL] [PKCS11] [MH] [PF_INET6] [eurephia] built on Jan 26 2010
May 17 00:56:58 saeed-laptop nm-openvpn[11482]: WARNING: No server certificate verification method has been enabled. See [URL] for more info.
May 17 00:56:58 saeed-laptop nm-openvpn[11482]: NOTE: the current --script-security setting may allow this configuration to call user-defined scripts
May 17 00:56:58 saeed-laptop nm-openvpn[11482]: WARNING: file '/home/saeed/Documents/config/VPN_Connection.key' is group or others accessible
May 17 00:56:58 saeed-laptop nm-openvpn[11482]: /usr/bin/openssl-vulnkey -q -b 1024 -m <modulus omitted>
May 17 00:56:58 saeed-laptop nm-openvpn[11482]: LZO compression initialized
May 17 00:56:59 saeed-laptop nm-openvpn[11482]: RESOLVE: NOTE: (address omitted) resolves to 12 addresses, choosing one by random
May 17 00:56:59 saeed-laptop nm-openvpn[11482]: UDPv4 link local: [undef]
May 17 00:56:59 saeed-laptop nm-openvpn[11482]: UDPv4 link remote: [AF_INET]IP address omitted
May 17 00:57:39 saeed-laptop NetworkManager: <info> VPN connection 'VPN Connection' (IP Config Get) timeout exceeded.
May 17 00:57:39 saeed-laptop nm-openvpn[11482]: SIGTERM[hard,] received, process exiting
May 17 00:57:39 saeed-laptop NetworkManager: <info> Policy set 'Auto Belkin' (wlan0) as default for routing and DNS.
May 17 00:57:51 saeed-laptop NetworkManager: <debug> [1274043471.002409] ensure_killed(): waiting for vpn service pid 11477 to exit
May 17 00:57:51 saeed-laptop NetworkManager: <debug> [1274043471.002596] ensure_killed(): vpn service pid 11477 cleaned up
I removed IP addresses. I think its a recent update might have created this issue. I tried re-installing openvpn and network-manager-openvpn.
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Jul 1, 2010
I'm trying to configure internet access using KDE network manager. Added new VPN connection, set gateway and other options but connection breaks. Here is /var/log/daemon.log
Code:
Jul 1 17:35:22 dvinokurov-desktop NetworkManager: <info> Starting VPN service 'org.freedesktop.NetworkManager.pptp'...
Jul 1 17:35:22 dvinokurov-desktop NetworkManager: <info> VPN service 'org.freedesktop.NetworkManager.pptp' started (org.freedesktop.NetworkManager.pptp), PID 1761
Jul 1 17:35:22 dvinokurov-desktop NetworkManager: <info> VPN service 'org.freedesktop.NetworkManager.pptp' just appeared, activating connections .....
log[ctrlp_rep:pptp_ctrl.c:251]: Sent control packet type is 12 'Call-Clear-Request'
Jul 1 17:36:02 dvinokurov-desktop pptp[1773]: nm-pptp-service-1761 log[call_callback:pptp_callmgr.c:79]: Closing connection (call state)
As I understand the main problem is in "(IP Config Get) timeout exceeded".
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May 17, 2010
My spouse bought me a Seagate BlackArmor NAS 110 recently, and I finally had time to connect it to our home network. I have samba installed, and my linux box (opensuse 11.1) can see the NAS, but when I try to open the network connection I get a "timeout on server" message. I bumped up the network connections, but still no luck. The odd thing is that last night I was able to connect and see the public folders for awhile. And her Windows Vista computer seems to connect without a problem after using the seagate software.
I'm no network admin, and have exhausted my resources on this.
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Jan 11, 2011
I installed linux 2010 mandriva on a (embeded) system,and i run several server programs on it that accept connections from clients. clients are connected to server(s) and every things is ok, but when i go to home and back to my work tomorrow, i see no data can be sent to server programs and this problem exists until i restart the server programs or reconnect tcp client programs. this problem occurs even when both client and server programs executed on the same (embeded) system.why this happens? i checked by netstat and see that server ports exists in the list(and not closed by kernel) but it seems kernel or an application above it prohibit data transmission.i changed the OS and installed ubuntu but the problem exists.
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May 6, 2011
I am trying to set up an ssh server on my Debian squeeze box so that I can access it remotely when I'm not at home. I connect to the internet through an at&t 2wire modem/router. First off, I *can* ssh into the machine from inside the local network, e.g.
[Code]...
Nmap done: 1 IP address (1 host up) scanned in 2.12 seconds Playing around with Nmap, I also found that it only sees port 50001 as open.
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May 17, 2010
I am facing issues on few machines but rest all are ok. They have the same config but I don't know what is wrong. I tried as much as I could but couldn't fix it. Here is the rpms installed on this client
[code]...
The same config is working for all clients but have problems with few machines. May be I am doing something wrong in config or testing at very basic level.
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Apr 1, 2011
I have a user using Mac OSX and ssh-ing to a couple of Redhat servers, one running RHEL5 and the other RHEL6. The user's connection seems to be timing out after 60 minutes or so of inactivity. The user is on the same subnet as the servers. Both servers have the same sshd_config files with the following entries with regards to timeout:
TCPKeepAlive yes
ClientAliveInterval 30
ClientAliveCountMax 99999
In a nutshell, his office Mac keeps getting dropped off both machines. Other machines, including the Mac he logs in with from home doesn't get timed out and keep the connection open. The log files are unremarkable and the switch port shows no errors
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Dec 29, 2010
I am using select to read the data from socket. on a load of 25 req per second, for some req i am getting the timeout in select (returning zero), but i am able to see the data on TCP using wireshark. kindly suggest what could be the possible reasons.
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Sep 11, 2010
Samba doesn't seem to disconnect on shutdown except by timing out, causing a loooong Lucid shutdown. (I can disconnect manually before shutdown by unmounting the Samba shares, and shutdown is then very fast.) Apparently Network Manager is somehow involved. I've installed a NM shutdown Samba script which works for the first user account, but not for the second user account (which was created and then put into the admin group).
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Apr 28, 2011
I am having a problem with 5.4 that I did not have with 4.5. The problem happens only sometimes but in specific instances. Basically a summary of the problem is that certain network transactions timeout. The specific instances are with wget, rpm, http. The problem usually, but not always, occurs with pptp stuff. (NOT running pptp but getting pptp stuff). For instance, the following command, which finishes in seconds on non-5.4 OS's:
wget [URL]
downloads about 20% then gets stuck. About 5 minutes later it downloads another 20% and then gets stuck, etc. The same thing with rpm:
rpm -ivh [URL]
waits about 3 minutes and then gives an error. I think it does the same thing as the wget but
wget will keep trying, while rpm gives up. The error from rpm:
Retrieving [URL]
..five minutes later:
I can wget the above as I mentioned before and install it that way. Before I do it, yum works fine. Afterwards, yum exhibits the same behavior of timing out (because it is using the pptp repository). Also visiting the pptp web site from Firefox times out on certain pages. I originally thought it was some problem with the pptp site, but I notice that log into hotmail.com. Does the same thin (fine on other operating systems). A view with Wireshark on the wget (pptp) shows the my machine receiving a reassembled TCPPDU from 216.34.181.96 (Sourceforge), sending an ack, receiving a reassembled PDU, sending an ack, receiving, sending followed by the 5 minutes or whatever of nothing. Then sourceforge sends an RST and a SYN and the process is repeated.
When I put the machine directly on an AT&T IP connection (12.147.X.Y) everything worked fine. Same with Comcast on a direct link. The times I am having problems is when our router is hooked up to a Comcast IP (70.88.X.Y) and assigns 192.168.5.X addresses to our machines. So when I was doing the above from 192.168.5.27 going through the router through Comcast is when I had the problem. So it is probably something with the router, but it is hard to figure out since CentOS 4.5 and Fedora do not exhibit this behavior, nor does 5.4 on most sites (mail.yahoo.com for instance). I did verify, at least from what I could, that ICMP type 3 and 4 are not being blocked. If they were, the same problem would happen on other op systems. And I was able to ping, albeit just locally, but we looked at the router settings and ping was not blocked.
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Jun 13, 2011
I have got pptpd linux server and pptp linux client which connects successfully. Now I want setup idle time (inactive) in pptp linux client so that if the pptp tunnel is inactive say for example 5 minutes it will be automatically disconnected. how can do that, is there any built in feature on pptp client?
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Jul 10, 2011
Im running several linux boxes, all redat enterprise linux. Versions vary between 4 and 5.
Since we have problems with our DNS servers, Im trying to lower the DNS resolve timeout to the minimum to avoid system hangs etc.
However, it seems that nothing I do have any effect. when Im running time nslookup whatever.com or time host whatever.com while my first DNS server is down, it always takes about 1.09sec as opposed to 0.09sec when the first server in the list is available. I tried playing with options timeout:X attemps:X but it simply doesnt seem to do anything, even if I set it to high values. Some internet posts suggested having timeout:0.5 or less, but that also doesnt seem to do anything.
when I use:
options timeout:0.3 attempts:1
- doesn't do anything.
options timeout:1 attempts:1
- doesn't do anything.
options timeout:10 attempts:3
- doesn't do anything.
It doesn't work when I put it in the first line of the file. It doesn't work when I put it in the last line of the file.
It doesn't work if I put it in "export RES_OPTIONS=options timeout:X attempts:Y"
I tried it on 2 different machines.
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Feb 21, 2011
im on node1 when i type the command ssh node2@ip the terminal hangs up a bit then an error message stating that connection timeout but here is a thing: i cant ping to node2
but i can terminate the ping manually using ctrl+c when i terminate the ping usual message appears stating 10 packets transmitted, 100% loss
ps: when i go to node3 and ssh to node2 it works fine and also i can ping from node3 to node2 very fine. and the firewalls are down at all nodes -all wired connection over a switch
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Feb 21, 2011
when i type the command ssh node2@ip the terminal hangs up a bit then an error message stating that connection timeout but here is a thing: i cant ping to node2 but i can terminate the ping manually using ctrl+c when i terminate the ping usual message appears stating 10 packets transmitted, 100% loss ps: when i go to node3 and ssh to node2 it works fine and also i can ping from node3 to node2 very fine. and the firewalls are down at all nodes
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Mar 13, 2011
I'm getting a timeout error from NetworkManager when attempting to connect to my router/firewall.
Excerpt from /var/log/messages attached.
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