Networking :: Network Stopped Working For No Apparent Reason
Apr 8, 2011
Network stopped working about a month ago. I installed ubuntu again, and network worked fine, and I turned off updates to keep things stable. Now network stopped working again. No changes had been made to it.I put in the ubuntu install cd, and network works fine off of it. I did not reinstall again. ifconfig shows eth0 with correct ip address, but 0 RX/TX packets.
Cant ping anything from it, and cant ping to it from other computers.I'd really rather not reinstall yet again, any ideas on how I should go about diagnosing this problem?Ubuntu 2.6.35-28-generic-pae #49-Ubuntu SMP Tue Mar 1 14:58:06 UTC 2011 i686 GNU/Linux
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Apr 7, 2011
I just want to see if anyone else is having problems connecting to networks, wifi or wired. For some reason, I can see both wired and wireless networks available but when I try to connect, it times out. I updated a couple of days ago and suddenly started having problems today. Anyone else having the same problem?I have only tried the router and repeater I have to connect to. My other computers are working just fine. One is actually running as a Debian server with no GUI (which I do not update as often). The other is a Mac.
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May 4, 2010
I was struggling frantically this morning for about 5 minutes after I booted up my computer, and wondering why it couldn't connect to the internet. After I figured out that the automatic wired network "Auto eth0" was gone from the network manager, it was easy to manually add it back. But why did it disappear in the first place?
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Jul 13, 2011
I go to the icon and it says "wireless is disabled by hardware switch", well I didn't press any hardware switch. My laptop is a Dell L501X, the "hardware switch" is the Fn button and F2. I've tried pressing this but nothing happens.
Is this a bug with the latest linux version? Cos everything was working fine until my laptop updated.
The version I have now is "Linux 2.6.38-10-generic"
I'm running 11.04 64bit.
Here is some info from console :
Quote:
me@XPS-L501X:~$ sudo ifconfig -a
eth0 Link encap:Ethernet HWaddr f0:4d:a2:59:00:34
inet addr:192.168.1.3 Bcast:192.168.1.255 Mask:255.255.255.0
inet6 addr: fe80::f24d:a2ff:fe59:34/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
[Code]....
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Jun 14, 2009
Ive been searching half the internet for a solution for a strange problem im having with a server (CentOS 5.2 Final). For no apparent reason, the server will just be powered off.I've looked in the dmesg log and /var/log/messages file, but that doesnt show anything, except the "syslogd 1.4.1: restart." message after booting it up again, and hours in advance of the crash a "suhosin" alert message.
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Jul 1, 2011
I have just installed (after a series of crashes during the install) Fedora 15. I also have Ubuntu Natty installed and use it primarily but I wanted to reach out and try new distros.I've wanted to try Fedora and finally got enough nerve to try. Installing it crashed for no apparent reason several times.ehow it installed and booted right to Fedora.However, when finally figuring out how to run the updates, I began to have the same problem.(Someone elsewhere suggested trying to update through command line--which I did finally though I had a few crashes doing this).
Now I am logging in and then it will just inadvertently crash. I could be in firefox, or using terminal, etc. There doesn't seem to be much rhyme or reason to why this is happening and I feel frustrated. I really want to test out Fedora (it looks so nice!) but can't manage to stay afloat more than a few minutes. I might also mention that this does not happen in Ubuntu at all so I can't account for the issues. I have much to learn but I feel a bit intimidated by Fedora because it's so new to me.
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May 20, 2011
I woke up this morning to a message saying I have low disk space in /home. My /home partition is 150 GB, but I had only 4 kB left. I promptly rebooted, which helped, but I still only have 40 GB available. Now, I use only 26 GB, so where the rest is, I don't know. In the disk usage analyzer, a lot of the space was not accounted for, as shown in the image.
Here is the output from df -h and du
simen@simen-laptop:~$ df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda5 55G 8.0G 45G 16% /
none 2.0G 368K 2.0G 1% /dev
[Code].....
I checked out .gvfs and it's just a CD I have playing. I really don't know what's going on.
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May 21, 2011
I've been an Ubuntu 10.04 64 bit user for one year. My Ubuntu distro is installed on an ext2 file system. Occasionally, I experience disk checks during boot without any system freeze or power loss.Sometimes, once reboot, the system works fine but Evolution Mail requests a new account, as if it was used for the very first time.Does anyone know how to fix this problem?
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Nov 24, 2010
my trackball mouse just freezes for no apparent reason about every 15 minutes
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Nov 24, 2009
I have Debian installed a year ago, working perfectly until last week when network card connected to internet stopped to communicate. I did no change in configuration. It just stopped to work while I was reading an online web page. Network card connected to local network still works fine.
I thought it might be a NIC failure so I installed a new PCI NIC but no change, still no communication throught this NIC.
I verified/changed cable between NIC and the router, no luck. If I connect the same cable from router to a Windows PC, everything is OK. If I connect back to Debian machine, it does not work.
I tried connect this NIC with a different router with DHCP enabled, nothing, NIC will not communicate with DHCP server.
I tried to set static IP, no change.
Today I booted a Knoppix 6.2 and this NIC worked perfetly! It set up using DHCP, I could access the internet.
I booted machine as usual and the problem still persists of course.
This is information captured immediately after boot. The trouble NIC is eth0 after boot finishes.
All this was captured with eth0 connect to a router with DHCP enabled. There is no DHCP entry in syslog related to eth0. Reinstall is the very last option.
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Dec 14, 2008
I have a laptop, and the wireless and cable worked fine for a while, but one day, for some odd reason, the wireless and network cable just stopped working. I'd connect to the web, and I would get output using "ifconfig" and the GUI wireless signal. When I hook up the wire, it detects it. However, no matter what I can't load any web pages. The wire does work in another house, and my windows partition utilizes these devices well. Any ideas?Additionally, I am able to log into my wireless router and change configurations, but that's about it :/.
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Sep 1, 2011
I have not used wired network on my desktop for some time, and now it appears to be not functional. Wifi works fine.
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May 7, 2010
i have lucid installed on my toshiba laptop after after an update my wireless stopped working keep asking for password and my wireless card is not detecting no wifi :
*-network UNCLAIMED
description: Ethernet controller
product: AR5001 Wireless Network Adapter
vendor: Atheros Communications Inc.
[Code].....
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Sep 21, 2010
I'm not a total newbie, but run into some strange problems with my installation of Lucid.Everything was working fine yesterday. I shut down the laptop and powered it up this morning and had problems with network. I have two NICs (wired and wireless). Both are set to pick up IP settings from DHCP and both do, however when using wired network I can't communicate with outside world - can't even ping the default gateway (but pinging 127.0.0.1 or IP address of the NIC no problem, so stack should be OK).When on the wireless network everything works fine (otherwise I would struggle to write this post ).What is very weird though is that I have a VMWare Player installed and using Windows VM on wired network works just great!
I noticed that when you're persistent it happens that you can ping but huge chunks of traffic are lost (e.g. packet 1-10 would pass, 11-40 would be lost, 41-59 would pass and so on).I restarted Ubuntu, tried shutting down interfaces, disabling networking and nothing helped. I don't recall performing any changes (at least that I would be aware of).Can anyone suggest something?BTW. This is not DNS issue as both IP addresses and FQDNs do not work. When I refer to using a given network (wired or wireless) the other one is down with ifconfig command...
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Oct 22, 2010
It has been a while and many ubuntu updates since i connected the windows laptop, it used to work fine but this ubuntu machine keeps telling me the cable is unplugged. When i boot into windows XP the network works fine and the laptop can connect through the network to use the internet. I have a very simple home network ... 3 pc into one switch. I am by no stretch of the imagination good with networking
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Jan 15, 2011
My desktop computer has another Linux distro on it. Wired networking was working fine. I wanted to try Ubuntu 10.10 so I installed it on a spare USB HDD. After install, networking still worked on both distros.
I moved the USB HDD to my win7 laptop and Ubuntu 10.10 booted fine. Once booted, Ubuntu asked to configure wireless on the laptop. I tried to do this but it did not work.
Therefore, I moved the USB HHD back to the desktop and booted. Now the wired network does not work from either Ubuntu or other distro (fedora 14). And to top it all off, the wired network will not work even from the Ubuntu live CD.
I have checked all connections, switches & cat5 cables to my desktop computer. I can still access the network and internet from my laptop (in win7) so I do not believe it is an infrastructure issue. I can confirm that everything works from the cable out of the back of the desktop through to the internet.
Here is the output from the usual troubleshooting commands in Ubuntu 10.10 code...
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Jul 26, 2011
My network manager application went missing a few days ago. I enabled it by right clicking on the taskbar above and opting for "show". It reappeared and worked fine. After I rebooted, however, it was there ok, but it doesn't respond to clicking at all. It has stopped working.
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Nov 25, 2010
Right so yesterday my internet worked fine. Today - no connection at all. The light for my cable on the router doesn't even show up. I originally had indicator-network installed, so when the internet first stopped working, I tried a few other options such as tethering to my phone via usb and bluetooth (which I have successfully used in the past). However, these didn't work, and I figured that as connman is still in beta, maybe that was why. So I reinstalled network-manager and network-manager-gnome via a usb stick, uninstalled indicator-network, and rebooted the computer. Still no internet.
When I click on the applet, it says "No network devices are available". This is odd, as I definitely have a network device... it is part of the motherboard. So I thought I'd do the SMARTlan test or whatever it's called. It's part of my BIOS, so I ran that and it returned results that I (kinda) expected: when the cable wasn't plugged in, it returned one set of results. When it was only plugged into my computer (and not the router), it returned another set of results. And when it was plugged into both my computer and the router, it returned a third set of results. So that leads me to believe the cable itself is fine.
And when I move the cable to a different port on the router, nothing changes. The corresponding light still doesn't come on. Network-manager, telling there are no network devices. The BIOS can see the ethernet port and the cable. And the router is functioning perfectly for my parents' computer and my ps3. And I have checked the cable to my computer for physical damage - it follows the same path as the one to my ps3, and on top of that, nothing physical can possibly have happened to it in the last day. This happened once before, except I don't think the network devices were lost.
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Feb 19, 2011
I have somehow messed up my network (onboard) card in the process of configuring network settings. how I managed to do so is that I did not use ifdown before making changes to my "/etc/network/interfaces" file. Also I think it might be relevant to mention that the sshd was running -although with no active connections at that time- since I have the service installed on my 10.04 Ubuntu Server (x64). So step by step what I did to end up with no network connection:
1) sudo cp /etc/network/interfaces ~/myfiles/interfaces.original
2) chmod 444 interfaces.original
3) sudo nano /etc/network/interfaces and then applied my network settings (IP, netmask, etc.). The syntax and configuration of my "interfaces" file is without flaw since it was simple, typical and was assigning my up to then DHCP assigned IP of 192.168.2.3 to static.
At about that point and although "ifconfig" showed the changes had been applied as planned the network card stopped working. I could no longer ping anyone but myself and the leds both on my network adapter and on my switch were turned off. Since my configuration also has a Windows 7 installation I rebooted to Windows in hope of troubleshooting through device manager but I got an error code 10 which means that the adapter could not start. Did I fry my network adapter for good and for all or I still have a chance of repairing it?
PS: After a closer look I saw that the NIC's LEDs indicate that the device cannot start. I am considering to reboot my MB as a last resort since the NIC is an onboard device and changing BIOS settings has done nothing to restore it.
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Apr 13, 2011
After 2 years of good service and after I've changed IP addresses in the router from 192.168.1.2 to 192.168.1.102 my autofs stopped mounting my NAS with NFS. That was the only change.
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Aug 2, 2010
I have posted this in networking, but perhaps it should have been here. Can anyone give me a clue on how to get my networking to work again? I don't care about sound.Last night I was trying to get my printer working, and when I rebooted, I lost networking and sound.I am currently booting on a live CD, and sound and networking are fine-- so it can't be a hardware issue (obviously). I must have inadvertently broken something, but I can't figure it out.
I have tried restarting networking, but it doesn't respond-- it says stop/waiting or something like that.I can't access the sound preferences-- it says waiting for sound to respond (or something like that).When I reboot, sometimes I see a terminal window with the same line scrolling very, very quickly-- something about waiting for USB.Additionally, the system is very slow to respond-- clicking a menu item can take a long time for it to appear, etc.
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Jul 13, 2011
When originally installing 11.04 I had problems getting my Ralink 5390 wireless card to work.
Today my computer froze completely and I had to turn it off via the power switch. When I turned it back on, wireless was no longer recognized! My iPod can connect to the network just fine, so it must be an Ubuntu problem. There are no problems with my ethernet connection either.
I researched this and found several threads about blocking and unblocking wireless devices using the rfkill command. Well, unfortunately for me the rfkill command doesn't work. When I type sudo rfkill list or sudo rfkill unblock all, nothing happens; it just returns me to my bash prompt. I even tried uninstalling and reinstalling rfkill...nothing.
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Aug 5, 2010
I've run into a situation where knetworkmanager tells me networking is disabled. If I switch to the ifup method in Yast then I can get online but when I switch back to user controlled knetworkmanager tells me that networking is disabled.I've actually had this happen twice.The first time I somehow managed to get it working again (I thought it was by right clicking on the icon in the system tray). This time I don't see the same option.Has anybody got any suggestions on how to get knetworkmanager working again.
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Sep 18, 2010
over the last couple of weeks, firefox has asked to be upgraded a few times. shockwave flash has also asked to be upgraded. sometime last week after upgrading shockwave flash all video stopped. so i have no videos, video in webpages just shows a grey box, with a light grey arrow.i have been very busy so i have taken time here and there to check the internet for solutions. there appear to have been problems with macs' and a lot of the problems appear to be from august 2009 onwards,am not sure it is the same problem.i am running opensuse 11.1mozilla firefox 3.6.10shockwave flash 10.1 r82 is enabled
code:
uname -a
gives me:
[code]...
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Sep 1, 2011
After a recent flash update it has stopped working in firefox 6 and konqueror. I am using 11.4 kde 4.6.5. Never had a problem with flash till now.
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Jan 24, 2011
I am a Windows refugee who discovered Ubuntu as a way to save my files from my virus-ravaged computer. Had no installation discs for Windows, so when I had to wipe my hard drive and start over, I decided to give Ubuntu a try. I've had mixed success, but that's another post...
Right now, the problem is that I installed 10.10 two weeks ago and was able to connect to the Internet with no problems - until yesterday. Suddenly, our wireless network (the only one in the vicinity) does not come up as available in Network Manager. In fact, the entire wireless option disappeared. I know there are many posts and threads on here about this, but weeding through them trying to find an answer is more frustrating than actually dealing with the problem. I know the router works because I can post on this forum from the Macbook. I really like Ubuntu and would like to keep using it, but not being able to connect to the Internet now on top of the other issues I've had is making me doubt I want to continue down this Linux road.
P.S. When I attempted an analysis through System Testing, it said something about there being no proprietary drivers?
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Jul 20, 2010
I have been using Opensuse since 11.0, and I never had any problems with the setup of CUPS printing (university based). Now for the first time, after many months of flawless printing using 11.2, after installing 11.3 the printing has stopped working. I use the same method: Print via print server machine -> CUPS server (IPP) and I test the connection. In my 11.2 it shows "OK", in 11.3 (I also tried with firewall off) I am getting the following (I have substituted the actual values with xxx for privacy).
[Code]...
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Jul 22, 2011
I managed to kill KNetworkManager today and I'm not sure what I did. This is a netbook running openSUSE 11.4 with all updates applied and KDE 3.5 (from the openSUSE repository). Normally, I use knetworkmanager to connect to the Internet. Everything was working fine this morning and today I decided to apply whole disk encryption (using cryptsetup and luks) to it.
So, I backed up the files, encrypted the partitions, made some adjustments to /etc/fstab and /boot/grub/menu.lst, and copied the files back. Everything is working fine, except for knetworkmanager. When it goes to connect, it starts off with the "gray Earth" (to represent no connection) and then it switches to the "connecting" icon for a fraction of a second, and then it's back to the "gray Earth". Looking at the output of iwconfig, it hasn't connected to the router at all (the essid is blank).
The connection works fine using ifup. I tried using cnetworkmanager (the console version) and it spits out errors like this:
Code:
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Jun 20, 2010
My main PC has AN Athlon X2 4600+ on an Asus M2npv-vm. Has been working fine for ages running Ubuntu. Today it the system locked up and I had to do a reset. Since then it will not connect to the router or cable modem. I can connect another PC to the router, so that looks okay.
What can I do to test the network connection from Ubuntu? It's not even getting an IP.
I suppose it could be something has died in the hardware, but want to eliminate other possibilities first.
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Jul 6, 2010
I got connecting to our NAS over NFS working perfectly. Direct NAS Reading & Writing - How? But on Saturday I found out it had stopped working. For no apparent reason, not straight after an update either I don't think. When I manually try to mount --verbose:
mount 192.168.100.14:/IHL /mnt/IHL --verbose
mount: no type was given - I'll assume nfs because of the colon
mount.nfs: timeout set for Tue Jul 6 14:48:32 2010
mount.nfs: text-based options: 'addr=192.168.100.14'
mount.nfs: Unable to connect to 192.168.100.14:111, errno 111 (Connection refused)
mount.nfs: mount to NFS server '192.168.100.14:/IHL' failed: System Error: Connection refused
Corresponding fstab line that used to work just fine. 192.168.100.14:/IHL /mnt/IHL nfs auto 0 0 For now, I can drop back to Samba but this is a PITA as I can't open OpenOffice documents and write to them directly on the NAS. The fact smb://192.168.100.14/IHL works proves networking wise we're cool too. There is no firewall between this PC and the NAS, the NAS is instructed to allow my PC's LAN IP full access. OpenSuse's software firewall has been told to allow NFS Client too. Why would this setup break out of nowhere? How can I debug this best? I see nothing relevant in /var/log/messages How can I get it to work again? A hopeful reboot didn't do its usual wonders...
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