Ubuntu Networking :: 9.10 Dropping Network Connection Randomly?
Feb 20, 2010
I have a windows installation (partition) but have installed into freespace on the same drive using the auto-partition manager, etc, and everything is fine. I got my network going fairly easily by going Preferences > Wireless and inputting SSID and WPA encryption key (PSK). My router issues an WLAN IP, I can get on the net, I can see my other Windows PCs on the network, I can reach my router, and all is good.So after several hours of mooching about and looking at things, I have updated all the Linux packages via Synaptics (following a prompt to update everything) including GRUB. My dual boot now shows two versions of the OS:
GRUB 1.7~Beta4
Ubuntu, Linux 2.6.31-19 - generic (I am booting this one)
Ubuntu, Linux 2.6.31-14 - generic
I also set up my HP F4580 printer over wifi on the network though with slightly incorrect drivers (for the F4400 series as this was recommended at the closest match). It works, and I can print a test page no problem.The only thing is that now (since doing all that) Ubuntu seems to periodically drop my connection to the network and then request the network PSK again, but when I enter it, it spends time trying to renegotiate but fails, and then re-requests the PSK, over and over and it never reconnects. I have to reboot and then I can connect again (automatically), until it drops at some random point (like 5 or 10 mins later)
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Jan 29, 2011
I have a Broadcom Corporation NetXtreme BCM5721 network card on my server at work.Everything works fine for a few weeks, then randomly the network connection on the server will stop working. After it stops working, I will try to reconnect with the network manager, it shows a wired connection available, it shows the "connection in progress"animation, then the "connection disabled" icon.
I uninstalled the network manager and used manual configuration, but do you think the network manager was the issue? I can't have the server disconnecting randomly every few weeks with no way to know what the real problem is. Was there an issue with the network manager with 10.04?
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Jan 4, 2010
I'm using Ubuntu 9.04 64 bit on an Asus laptop and the wireless connection disconnects randomly for a while and keeps searching for the signal. When it finds it I have to put in my WEP key again to get it to connect sometimes only once or sometimes 2 or 3 times. This is getting quite annoying.
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Dec 27, 2010
Lspci:
05:00.0 Ethernet controller: Marvell Technology Group Ltd. 88E8056 PCI-E Gigabit Ethernet Controller (rev 12)
My wired LAN keeps dropping randomly, average of every 30-60 minutes. Fresh install of 10.10 from iso, Been installed for about 4 days now, just performed system update today, no change.
My router actually completely resets itself. You can watch the lights power off and recycle doing their POST. Absolutely no problems in windows 7 dual boot configuration.
I am no downloading anything, not streaming, not doing anything actually. My computer is completely idle (save for BOINC) and all of a sudden my phone loses the wireless connection which lets me know that my router just reset.
Ubuntu is actually doing this, my wireless stays up indefinitely in windows. Once the router resets, it does automatically reconnect without a PC reboot, but why is it resetting my router?
If you need the bootscript, already posted here: http://ubuntuforums.org/showthread.php?t=1651262
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Sep 1, 2011
Once or twice an hour or every few hours the interface will drop off. When this happens and comes back up and ssh sessions I have open will sit there and lag for 15-20 sec while, I assume, the connection is re-established. Any sessions I have open to the mySQL database will be dropped and I'll be given error messages associated with loosing connection to the SQL server. I have run a constant ping against the server and when the interface seems to drop off I'll get 10 or so host unreachable and it'll then start to reply again. This happens with both eth0 and eth1 on this Dell Poweredge 850 running 11.04. I have done a "sudo lspci -v" on both the server acting up and another Natty box that doesn't have this issue but the same hardware. They both are using the same driver versions though it seems certain options are slightly different between the two.
Working Server:
Code:
04:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5721 Gigabit Ethernet PCI Express (rev 11)
Subsystem: Dell Device 01b6
Flags: bus master, fast devsel, latency 0, IRQ 16
Memory at fe8f0000 (64-bit, non-prefetchable) [size=64K]
Expansion ROM at <ignored> [disabled]
Capabilities: [48] Power Management version 2
Capabilities: [50] Vital Product Data <?>
Capabilities: [58] Message Signalled Interrupts:Mask-64bit+ Queue=0/3 Enable-
Capabilities: [d0] Express Endpoint, MSI 00
Capabilities: [100] Advanced Error Reporting <?>
Capabilities: [13c] Virtual Channel <?>
Kernel driver in use: tg3
Kernel modules: tg3
Broken Server:
Code:
04:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5721 Gigabit Ethernet PCI Express (rev 11)
Subsystem: Dell Device 01b6
Flags: bus master, fast devsel, latency 0, IRQ 16
Memory at fe8f0000 (64-bit, non-prefetchable) [size=64K]
Expansion ROM at <ignored> [disabled]
Capabilities: [48] Power Management version 2
Capabilities: [50] Vital Product Data
Capabilities: [58] MSI: Enable- Count=1/8 Maskable-64bit+
Capabilities: [d0] Express Endpoint, MSI 00
Capabilities: [100] Advanced Error Reporting
Capabilities: [13c] Virtual Channel
Kernel driver in use: tg3
Kernel modules: tg3
I've checked the cable, it's a pre-made with both ends looking good. I even swapped it out for a fresh home made cable and the problem still persists.
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Jul 17, 2009
I'm having a bizarre problem where my network connection stops working randomly. At first I thought it was a DNS issue since Firefox simply chilled out on "Looking up [hostname]" until it timed out, but after further investigation (pinging IP's, "host" and "dig" being unable to reach servers) it became apparent that I couldn't even access the DNS servers i.e. the Wicked Connection of the East was most sincerely dead.
There are two strange things about this: one, there are no errors except "timeout". The network manager is happy, Firefox is happy until the lookup fails... Two, the failures only start *after* DHCP configuration. DHCP configuration never has any trouble sending or receiving packets. I'm going to try static IP and whatnot to see if that helps, more information later.
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Jul 11, 2011
I have an Ubuntu box, 11.04 x64, running on a Dual Opteron SFF box (iWill ZMaxDP... pretty old machine). Up until a few weeks ago, it was acting as a Windows 2008 Server, but i moved it to Ubuntu.
Anyway, the machine will not stay on the network for any amount of time, without falling off... I have changed network cards, cables, ports on the switch, etc, and nothing seems to work. I have a Windows 2003 box giving out DHCP addresses, and for a while, i actually tured that off and setup a second Ubuntu box to give IPs... it made no difference. The box gets an IP, and can ping outside for a bit (2 min or so) and then just looses connectivity... ifconfig shows it with an IP (i have tried both Static and DHCP config) and nothing seems to work...
[Code]...
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Sep 11, 2010
I set up the web/backup server for our department and I'm having some major issues. Firstly, the server seems to be dropping the network connection periodically. I checked all of the logs and it appeared to be an IP6 issue as the only message that seemed to correlate with it was "eth0: no IPv6 routers present" in syslog. I added "ipv6.disable=1" to my boot options in menu.lst and this seemed to take care of the problem. However, I woke up this morning and the server was back down.
This didn't seem to take care of the problem. It seems to occur when my automatic backup scripts go through. I have several BASH backup scripts that use rysnc over SSH to backup several computers to the server and the server to my desktop at home. I was able to trigger the problem a couple of times running the backup script this morning. Now, I'm getting the following error when running the script, instead of losing the network connection:
Code:
Sep 11 10:22:40 chemistry kernel: [ 396.892699] BUG: unable to handle kernel NULL pointer dereference at 0000000000000118
Sep 11 10:22:40 chemistry kernel: [ 396.892715] IP: [<ffffffff811426c0>] __dentry_open+0x240/0x370
Sep 11 10:22:40 chemistry kernel: [ 396.892728] PGD 1113d5067 PUD 11458c067 PMD 0
Sep 11 10:22:40 chemistry kernel: [ 396.892737] Oops: 0000 [#1] SMP
Sep 11 10:22:40 chemistry kernel: [ 396.892743] last sysfs file: /sys/devices/system/cpu/cpu1/cpufreq/scaling_governor
Sep 11 10:22:40 chemistry kernel: [ 396.892750] CPU 1 .....
I tried booting with a previous kernel to see if that was the problem and I'm still getting this error. I've searched through all of the logs that I could think of to try to track down any software based problems and I just don't see anything. In the past, whenever I've run into such serious with a Linux box that popped up out of nowhere, it's always been a hardware failure. I've currently disabled all of the backup scripts and I'm going to see if it lasts through the weekend.
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Apr 30, 2010
using Hardy Heron on a old Thinkpad T41.This is a fresh install system and I noticed it kept dropping wireless connection. After google around, seems like this is a common problem? Then I switched to wired network, and turned out the same thing happens again. Looks like doesn't matter wired or wireless, it kept dropping itself from time to time.
fter checking syslog, I found something interesting...it kept complain eth0 is invalid, then it said it found a better connection?I found that extremely weird..
Code:
Apr 30 06:24:32 support kernel: [ 961.236895] e1000: eth0: e1000_clean_tx_irq: Detected Tx Unit Hang
[code]...
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Oct 16, 2015
We are having an issue where our network connection is dropping on our server. Everything was working for about a month without issues then suddenly we experienced a network outage. Here is what I found in our logs. Rebooting the machine was the only way to have everything come up.
Oct 16 09:20:59 server2 kernel: [2612816.936085] ------------[ cut here ]------------
Oct 16 09:20:59 server2 kernel: [2612816.936101] WARNING: at /build/linux-FpPMO6/linux-3.2.54/net/sched/sch_generic.c:256 dev_watchdog+0xf2/0x151()
Oct 16 09:20:59 server2 kernel: [2612816.936106] Hardware name: ProLiant DL380p Gen8
Oct 16 09:20:59 server2 kernel: [2612816.936110] NETDEV WATCHDOG: eth0 (tg3): transmit queue 0 timed out
[Code] ....
We have the same exact server, running the same exact debian version for over a year with no issues.
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Nov 1, 2010
I recently upgraded a 11.0 installation running on Xen Server to 11.3. I am experiencing frequent network disconnections now. The ip address and default gateway is assigned statically. However, the system seems to ignore the default gateway after a while. Then after several minutes it seems like it comes back.
Code:
root@poe5e:~/ > route
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface
192.168.111.0 * 255.255.255.0 U 0 0 0 eth1
172.16.107.0 * 255.255.255.0 U 0 0 0 eth0
link-local * 255.255.0.0 U 0 0 0 eth0
loopback * 255.0.0.0 U 0 0 0 lo
default 172.16.107.254 0.0.0.0 UG 0 0 0 eth0
root@poe5e:~/ > ping 172.16.107.254
PING 172.16.107.254 (172.16.107.254) 56(84) bytes of data.
64 bytes from 172.16.107.254: icmp_seq=1 ttl=255 time=0.515 ms
64 bytes from 172.16.107.254: icmp_seq=2 ttl=255 time=0.484 ms
64 bytes from 172.16.107.254: icmp_seq=3 ttl=255 time=0.496 ms
64 bytes from 172.16.107.254: icmp_seq=4 ttl=255 time=0.473 ms
^C
--- 172.16.107.254 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 2997ms
rtt min/avg/max/mdev = 0.473/0.492/0.515/0.015 ms
root@poe5e:~/ > traceroute orl3akm1n
traceroute to orl3akm1n (10.111.19.19), 30 hops max, 40 byte packets using UDP
1 172.16.107.250 (172.16.107.250) 0.405 ms 0.398 ms 0.357 ms
2 * * *
When my sessions suddenly die and I have to coax it into routing correctly again.
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May 10, 2010
Lately I have been using my window's partition due to the fact that 10.04 drops my wireless signal every 5-10 minutes, but today I downloaded the new updates and that seems to have fix the issue with the dropping of the wireless connection. Now the only problem is the internet is so slow when trying to go to webpages it times out. I have opened up firefox gone to about:config and changed the necessary lines, but still dreadfully slow.
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Nov 4, 2010
My wireless connection keeps dropping is very unstable, signal strength goes up and down here is the info i got from the terminal
*-network:0
description: Ethernet interface
product: 82801DB PRO/100 VE (MOB) Ethernet Controller
vendor: Intel Corporation
[Code]....
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May 13, 2010
Two weeks ago I decided to ditch my XP install completely and switch to Ubuntu 10.04. So far so good, and I'm very happy with my decision. However, about 3 days ago, my wired connection started playing up. It keeps dropping out every 2 hours or so between 13.00 and 04.00. After dropping out, it immediately reconnects again (at least when I use Automatically DCHP config). From 04.00 to 13.00 it is more or less stable.
I tried resolving by reserving an IP in the DCHP Client Table in my router (linksys WRT120N). Additionally, I told the Network Manager to use the Manual configuration. Unfortunately these changes didn't help and the problems stay the same......
The daemon.log shows the following information code...
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Jan 10, 2011
I've just loaded the new Hamachi2 Linux beta with Haguichi for a GUI. Everything installed & connects OK, but the connection at the hub is dropping & reconnecting every minute or so. I tried adding a line to the sshd_config file to keep it alaive but it didn't make a difference.
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Jan 5, 2010
Here's the situation: I've got an eee pc 901 running Ubuntu 9.10 netbook remix. I'm using it to connect to a WPA-encrypted wireless network on a WRT54GL running dd-wrt. It mostly connects and works ok, but sometimes it just stops working for no apparent reason (the netbook still shows itself as connected), but you can't get anywhere until you manually disconnect and reconnect. Other times, it will drop the connection, and then quickly reconnect (or sometimes not). Obviously, this behavior is pretty irritating. At first I thought the problem was with the router, but I checked the logs there and they all seem fine, and other computers on the same router don't have this problem. Looking at "dmesg | tail" on my netbook, I see a lot of instances of the following error, which I'm thinking is probably the problem:
Code:
[11137.762233] ERROR!!! RTMPCancelTimer failed, Timer hasn't been initialize!
[11142.872797] ===>rt_ioctl_giwscan. 4(4) BSS returned, data->length = 440
[11152.883274] ===>rt_ioctl_giwscan. 5(5) BSS returned, data->length = 556
[11152.883529] ==>rt_ioctl_siwfreq::SIOCSIWFREQ[cmd=0x8b04] (Channel=11)
[11163.952056] ERROR!!! RTMPCancelTimer failed, Timer hasn't been initialize!
I searched for that error message and I found this Ubuntu bug report: [URL] that describes symptoms that match mine. In that report, a poster mentions that he compiled and installed a new version of the wireless driver from the Ralink website, and it fixed his problem. Do you think installing a new driver would be good? Or has that updated driver already been added to the kernel since that bug report was filed? I've never compiled a kernel module before.
One other thing, I also see repeated instances of these lines (or similar ones) in dmesg, which look like they could be related.
Code:
[44096.275923] RX DESC f30ca000 size = 2048
[44096.276885] <-- RTMPAllocTxRxRingMemory, Status=0
[44096.281404] --> Error 2 opening /etc/Wireless/RT2860STA/RT2860STA.dat
[44096.281424] 1. Phy Mode = 0
[44096.281435] 2. Phy Mode = 0
[44096.309841] 3. Phy Mode = 0
[44096.314533] MCS Set = 00 00 00 00 00
[44096.316196] <==== RTMPInitialize, Status=0
[44096.316280] 0x1300 = 000a4260
[44096.401269] ==>rt_ioctl_siwfreq::SIOCSIWFREQ[cmd=0x8b04] (Channel=11)
[44096.472502] ===>rt_ioctl_giwscan. 1(1) BSS returned, data->length = 116
[44096.472977] ==>rt_ioctl_siwfreq::SIOCSIWFREQ[cmd=0x8b04] (Channel=11)
[44106.768056] ra0: no IPv6 routers present
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Jan 20, 2010
as the titles states my wireless is dropping out but the networks manager is still saying i have a connection. the only way i have been able to be on the network every minute or so i have to manauly disconnect and reconnect to my wifi. under my windows 7 and vista installs the wireless card works fine now my card is a dlink dwa-547 and it uses the arthores chipset, it is encprtyed wifi, wpa2 aes on a n/g based network
Code:
peter@ubuntu:~$ sudo lshw -C network
*-network
description: Wireless interface
product: AR5008 Wireless Network Adapter
[Code]....
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Oct 27, 2010
I have a Thinkpad W500 with:
Code:
Network controller: Intel Corporation Wireless WiFi Link 5300
I have Ubuntu 10.04 32bit installed:
Code:
Linux dani-laptop 2.6.32-25-generic #45-Ubuntu SMP Sat Oct 16 19:48:22 UTC 2010 i686 GNU/Linux
It has been working fine since I installed 10.04 but recently (end of last week I think) it stared dropping the wireless connection very often. So it will disconnect and reconnect, but I can't seem to find a pattern, sometimes it goes for hours without an issue and sometimes it does it several times in a row. Below is an extract of syslogs from when this happens. But not sure if what I need is there... the only weird thing I can see is:
Code:
Oct 27 18:58:33 username-laptop wpa_supplicant[1296]: CTRL-EVENT-DISCONNECTED - Disconnect event - remove keys
Code:
Oct 27 18:58:32 username-laptop wpa_supplicant[1296]: Trying to associate with 00:1e:be:a6:c0:0f (SSID='accessp' freq=5280 MHz)
Oct 27 18:58:32 username-laptop NetworkManager: <info> (wlan0): supplicant connection state: completed -> associating
Oct 27 18:58:32 username-laptop kernel: [123835.372217] wlan0: deauthenticating from 00:1e:7a:6f:d9:90 by local choice (reason=3) .....
Oct 27 18:59:29 username-laptop ntpdate[4765]: no server suitable for synchronization found
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Sep 26, 2010
I am running F13 on my Desktop (with a Ralink RT2870 wireless card) and also on my Laptop (Acer Aspire 5738Z) and am connecting to the internet via a NetGear router. On my Laptop I can connect to the internet fine with no problems. However on my Desktop when I turn my computer on it connects to the internet fine, and works, however after some time (maybe 5-10 minutes) it disconnects and the box asking for the password reappears, then I click connect but no joy.
The connection box just keeps reappearing and it won't connect again until I restart the computer (although sometimes it takes more than 1 restart!). This is not a signal issue, as my Desktop also has a Windows partition and that connects to the internet fine and does not drop off. I have installed the RT2870 driver through rpmfusion, which didn't fix the problem, although uninstalling the driver didn't stop the card from working.
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Oct 17, 2010
I usually start up my Internet service by typing ./rc.inet1. While its connecting I usually see my routers ip address then I connect and I start browsing and everything is fine. A few times I noticed that instead of seeing the routers address it showed some other address and I could not get online. I try ./rc.inet1 stop and renew but still cannot connect, I reboot and I then see the router and I can connect. I am using slackware13, and opera10 browser.
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Aug 8, 2011
Sorry if this has already been solved;answered anywhere else - I tried looking it up but to no avail. The problem persists & the hints I found around the forum did not provide a solution to the case, neither other net solutions i looked up I run Winblows at the lab and sometimes take my Ubuntu PC with me. There is an open Wireless network where they set MAC permission, and there's no pwd to access. It so should be fairly easy to change m MAC and access it, right! No. I run ifconfig and macchange, successfully change my MAC addr BUT the connection drops! Then if I change it back (MAC to my original address) it goes back online. And yes, I shut down the service -- "ifconfig wlan0 down" and then up..WHAT ON EARTH am I doing wrong??? No webpages touch this 'trouble-frigging-shooting instance!
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Mar 9, 2010
I have a Dell Inspiron 6000 laptop running Fedora 12. Recently my wireless connection has begun dropping every few hours and not reconnecting. After trying for about 30-45 seconds, the WPA password prompt comes up but still doesn't connect.
Fedora release 12 (Constantine)
Kernel Linux 2.6.32.9-67.fc12.i686
GNOME 2.28.2
Memory: 2.0 GB
Processor: Intel Pentium R 1.60 GHz
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Jan 30, 2010
Here is the layout of my network:My cable modem plugs into eth0 on my ubuntu server which acts as a firewall (shorewall) and dhcp server to my lan. A dd-wrt access point is plugged into eth1 and then a bridge connecting my xbox360 and another bridge connecting a desktop computer.Everything works pretty well, except a few times a day, my network will just shut down. The wireless on my macbook and my wife's laptop will just shut down, and if my xbox is running, it will lose connectivity. It will be down for maybe a minute or two, and then come back up like nothing ever happened.I never had this problem when I had just a dd-wrt router running everything instead of my server.When I ssh into my server afterwards and run dmesg, this is what I will get:
Code:
[398598.251548] martian source 169.254.1.255 from 169.254.1.33, on dev eth1
[398598.251565] ll header: ff:ff:ff:ff:ff:ff:00:23:69:3d:b1:82:08:00
[code]....
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Jul 7, 2011
My network seems to be dropping every few minutes to few hours. There are a lot of networks in the area (apartment in NYC) and I wonder if it might be due to competing traffic. Any ideas for how to tell what channels other networks are on? or other modifications to router settings that might improve performance in this situation?Additionally the "Invalid Misc" in iwconfig is counting quite quickly.
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Feb 25, 2010
As soon as i'm starting to copy a large file enough file (>700Mb) to my ubuntu box (connected to an Asus router via wifi) from a Windows 7 client (connected to router via ethernet cable) i get a dramatic drop in speed. upload starts at 1,0Mb/sec with a ping to ubuntu box at <1ms, and in 2 minutes it drops to 200kb/sec with a ping of over 1000ms! The ping increases with every second in a linear progression.
To exlude router as a possible problem copying to a windows 7 notebook connected to router via wifi results in an average of 2,7Mb/sec with an average ping of 150ms.
MB Model: Asus P5B Deluxe wifi
OS: Ubuntu Server 9.10 + desktop installed
Wifi configured via GUI
2. lsusb
3. wlan0
4. lsmod
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Dec 12, 2010
I've got a Belkin F5D8055 v1 wifi usb adapter. I use the rt2800usb driver for it. Strangely it uses only 54 Mbit/s instead of 300 Mbit/s. I thought it was ok, since I use the wifi only for accessing the internet. However, the network manager keeps dropping the signal, and I can't understand why. I'm close enough to the router.
iwconfig:
wlan0 IEEE 802.11bgn ESSID:"MyHomeRouter"
Mode:Managed Frequency:2.447 GHz Access Point: 00:22:2D:06:2C:50
[code]....
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Apr 13, 2011
Within the last couple of days or so, my wireless has been on the fritz. It keeps disconnecting and reconnecting every minute or so, which is annoying to say the least. The information relating to my wireless network is:
Laptop model: Toshiba Satellite L350
Wireless interface: Atheros AR5001 Wireless Network Adapter
Interface:
[code]...
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Jun 5, 2010
I could not find a solution to this problem anywhere. I use a ubuntu server to play (stream) mp3s and movies to other computers on my network. It works most of the time, but sometimes in the middle of a movie or a song it will drop/hiccup--saying it is "not reachable". I am not overtasking the server at all, and merely playing an mp3 that takes up less than 10% of the bandwidth, yet it drops it for a split second.
I have a WRT160N router (DD-WRT of course) with 4 clients connected (2 of which are wired). The ubuntu server is connected via ethernet and all machines have the same issue. It can't be the router because another Windows machine works just fine for streaming these files. I just can't understand how it can lose connection for a second or so. It may just be the file-system or some service that is hiccuping, but I have no idea...
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Aug 18, 2010
I do randomly (as far as I know) loose my wireless network connection. The only thing to do then is to restart my router and after that it works for a while. I know this is not a hardware issue because I don't have this problem with KDE, only in gnome. I think this problem occurred after I started using 10.04, but then I changed to KDE and forgot about it. But now I'm using gnome again and loosing my network connection over and over drives me mad
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Nov 20, 2010
My internet connection drops randomly in ubuntu but works fine in XP.The connection is not disconnected but i cant browse any sites,so what i do is i will reboot my system so that i can surf again but after few minutes the same problem is happening again
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