Ubuntu Networking :: Ethernet Stopped Working After Hard Reboot?
Jun 13, 2010
My computer wouldn't come out of sleep mode, so I had to shut it down improperly. Now there's no ethernet network connection. The NIC works as I can start the computer by wake-on-lan, but somehow Ubuntu no longer sets up a network connection on it.
The green light on the NIC is lit up and blinking. I have changed no settings. It used to get an IP address from the DHCP no problem, but ifconfig now only shows 127.0.0.1.
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Aug 12, 2010
Version: Ubuntu 10.04 Relavant hardware: P5QL Pro built-in ethernet, cable modem with linksys wireless-G router (although problem is with ethernet connection, not wireless)
One minute my ethernet was working, and the next it stopped working. The only thing that I did between it working and not working was install electricsheep from Synaptic and then I shut down the computer. When I restarted a bit later, no ethernet connection shows up.
I checked the cables, made sure they are in tight.
My laptop connects using the same ethernet cable fine. So its not the cable or the router.
I reset the router and the computer at the same time. Still doesn't work.
I don't know where to even start with troubleshooting this sort of problem. Everything to the extent of my computer knowledge seems to be working fine.
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Jul 23, 2009
After using fedora 11 for a month or two now the ethernet gave out on me tonight. However if I switch to my ubuntu or windows XP install it runs fine. I made no recent changes to network connections, and no installed programs that should effect it.
kernel version: 2.6.29.6-213.fc11
default connection: eth0(and only connection)
ifcfg-eth0:
# Networking Interface
DEVICE=eth0
BOOTPROTO=dhcp
HWADDR=00:1F:C6:DB:05:0C
ONBOOT=yes
TYPE=Ethernet
IPV6INIT=no
USERCTL=no
NM_CONTROLLED=yes
NAME=eth0
UUID=5fb06bd0-0bb0-7ffb-45f1-d6edd65f3e03
DNS1=192.168.1.254
PEERDNS=yes
PEERROUTES=yes
I have tried, restarting, older kernel, restarting services, and clearing the DNS Cache. The specific error I get is that "Firefox can't find the server", and most other applications return similar. I can however ping websites still. All other computers on the network are running fine, and booting into another system the internet will work. Just not for fedora.
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Jan 8, 2011
im not quite sure how to succintly say what is happening. the general idea is that my internet stopped working and I dont know why. I have a netbook that i am using while i am backpacking through asia. it has both ubuntu netbook ed, and winXP dual booting on it. out of the blue, i could not aquire an ip address through dhcp. This was true in both windows and linux, AND true while using either a wireless or wired connection. ok, that is odd, but not a big deal, i will just set the ip / subnet mask / gateway / dns manually. After doing this the computer reports properly connecting to the internet (did the same tests and got the same results in both nix and winxp), however I could not do anything on the internet. could not ping, nor do a dns lookup much less anything else.
scraching my head I looked around the internet for a solution and came across 'netsh int ip reset' this is a command I typed into the windows command line. I'm not sure what it does, but it worked so far as now
[Code]...
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Apr 22, 2011
my wired auto ethernet stopped working. It doesn't appear to be my machine or the hub as the connection is fine using windows on the computer.I'm a bit clueless on the Networking front in Ubuntu. I've brought up the Network Connections box and checked that the Mac address is correct (and it is). I've tried it on Lubuntu and Openbox, but still no luck. The only oddity I see is that the Network Connections box says that the auto ethernet connection has never been used .
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Mar 13, 2011
ethernet suddenly stopped working and can't get it back, says something about device not active but it works well with the Debian live dvd, what could be the problem?I'm using mobile internet now and this seems to have happened after setting up the mobile connection but I dont think it as anything to do with the wired problem.
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Feb 28, 2010
I hit Ctrl alt backspace, the black screen whit cursor appears and seems that run forever so rebooted, but mouse isn't working.
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Jan 24, 2011
I hadn't updated until yesturday night, today after the massive update and reboot, my x stopped working. What happens is, after the splash screen, both screens goes black and unresponsive. Tried killing X and alt + ctrl + f1 etc. I can probably fix this myself if I could access the terminal but, the other day I had to be stylish and remove everything from my grub boot besides Windows 7 and the default Ubuntu so I can't boot into root terminal. So, how would I gain access to a console before X starts?
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Mar 9, 2011
I have a bare Ubuntu install that I use to run Xbmc. It has been working perfect for a month. I reboot it every few days. This morning I decided to reboot when it came back up my remote stopped working. I hadn't done any updates since I build the box. Unless Ubuntu does them without asking. Here is the dmesg log
Code:
[ 378.197085] BUG: unable to handle kernel NULL pointer dereference at 00000038
[ 378.197101] IP: [<f953af51>] store_protocols+0x91/0x390 [ir_core]
[ 378.197119] *pde = 6f07b067
[ 378.197126] Oops: 0000 [#1] SMP
[Code]....
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Jun 11, 2011
I've been using ssh for a LONG time to connect my laptop to my desktop with no problems. I use a non-standard port (nnnnn) and keys. After a power outage that caused a shutdown and reboot, I can no longer ssh into the desktop. The only changes I've made are updates (laptop and desktop both running ubuntu 10.04).
$ ssh -p nnnnn Desktop
ssh: connect to host Desktop port nnnnn: Connection refused
No messages are generated in any of the logs on Desktop!
$ /usr/sbin/sshd -T
port nnnnn
protocol 2
addressfamily any
listenaddress 0.0.0.0:12023
listenaddress [::]:12023 .....
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Apr 2, 2010
I have been using my laptop as a development machine for a few months now, developing php/mysql applications, and testing them offline via the same laptop by pointing the browser to url.
But a few days ago, my url stopped working and I discovered that it will now only work if I have an active internet connection plugged in. Why has this happened and how to I fix my test server so localhost works with or without an internet connection via an ethernet cable.
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Jun 12, 2011
I use Linux Mint Debian XFCE and there was a large update (lots of programs) I have done prior to rebooting. After reboot, my computer can now no longer find the ethernet controller anymore in lspci, so my wired connection no longer works.
Is this a hardware issue? The green lights are all blinking fine though.
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Sep 18, 2010
I updated to the latest available kernel for Kubuntu 10.04 today (2.6.32-24). When the system rebooted, it refused to connect to my wireless network. So far I have been unsuccessful in persuading it to connect. ifconfig shows the existence of the ethernet connection as eth0, and Network Manager also seems to accept the existence of the ethernet port - so why has it suddenly chosen now to stop connecting to the wired network?
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Dec 28, 2010
The ethernet configuration files are under
"/etc/sysconfig/network-scripts" such as "ifcfg-eth0:1" etc.
The file looks as follow:
Code:
DEVICE="eth0:1"
BOOTPROTO="static"
ONBOOT=no
IPADDR="172.23.17.10"
NETMASK="255.255.255.0"
ALIAS="yes"
I've set the ONBOOT=no. This means this device should not be activated at boot-time. But as I reboot the machine, this device is activated again. This means the option ONBOOT doesn't work. Seems this is a bug of RedHat LINUX?
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Nov 19, 2010
I have installed Fedora 14 about 4 days ago. I have set all the networking parameters like dns path, hostname etc. I have also ensured that I select the check-box for "Enable automatically when system starts" for eth0 interface. But weirdly, whenever I boot my system(or restart), I see that the interface eth0 is disabled. I have to manually enter as root and enable it, each time I boot/reboot my system. Why is this happening? Could you please suggest a way so that I have eth0 interface enabled always when I boot up?Also, my domainname also is not boot-persistent. What steps should I take to ensure that the domainname set once persists across reboots?
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Aug 26, 2011
I have a 2TB hard-drive connecting via a usb port on my server for automatic backups. I noticed the backups had stopped working and then I realize I had lost the ability to communicate with the drive.
/sbin/lsusb gives:
Bus 005 Device 001: ID 0000:0000
Bus 002 Device 003: ID 046b:ff10 American Megatrends, Inc.
Bus 002 Device 001: ID 0000:0000
Bus 002 Device 002: ID 046b:ff01 American Megatrends, Inc.
Bus 001 Device 005: ID 059f:1018 LaCie, Ltd
[Code]...
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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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Jul 15, 2011
Acer 5250-BZ475 laptop, fresh install of Ubuntu 11.04. Boots up beautifully as long as an ethernet cable is plugged in. Otherwise, I get to the login screen and have just enough time to start typing in my password before the entire system hangs hard - no mouse, no keyboard, can't even get to a terminal, nothing. Have to hard power off the machine.
It seems to be a problem with the wireless card trying to initialize, but there doesn't seem to be a bios option to disable wireless on this laptop, so I'm a bit at a loss as to how to fix this problem. By the way, wireless works fine if I boot up with a cable connected - I can see all the wireless access points in my area no problem. I just can't boot without a wired connection, which makes my laptop more or less useless when I'm away from home with it.
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May 20, 2011
I'm having a strange problem with my ethernet card. In previous installs of 10.10 on this same computer, I've never had any trouble with either my wireless or my wired internet. However, after messing around with some other distros, I recently did a fresh install of 10.10 on this computer, and now only wireless internet is working. When I plug in an ethernet cable, I do not get connected.
One difference between this install and the previous installs is that, previously, I had always installed while connected to the internet via ethernet. This time I did it while connected wirelessly. I've tried methods from other threads, but I've had no luck. In particular, I have trouble "make install"ing the official Atheros driver, and I've installed the compat-wireless driver atl1c, but I'm still not getting a connection.
Here is the relevant output of lspci -vv:
Code:
03:00.0 Ethernet controller: Atheros Communications AR8152 v1.1 Fast Ethernet (rev c1)
Subsystem: Lenovo Device 396b
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 45
Region 0: Memory at d2000000 (64-bit, non-prefetchable) [size=256K]
Region 2: I/O ports at 6000 [size=128]
Capabilities: <access denied>
Kernel driver in use: atl1c
Kernel modules: atl1c
After a reboot, my ethernet is now working. I don't understand, but I'm happy.
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Jul 27, 2011
When I start my Ubuntu machine, it says "eth0 connection established". But i could not able to ping to other machines available in LAN & also to Internet.
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Nov 6, 2010
Wired and wireless networking have been working flawlessly for years on my HP Compaq 6710b laptop. Several weeks ago, after an automatic update via the update manager, my wired network stopped working. I did not notice it directly, since my wireless connection took it over. I only noticed it when I had to work in an office where I didn't know the wireless password.Since then, I have been trying several things and searched several forums. It is hard to find any troubleshooting information about wired networking, as most of the problems seem to occur with wireless.
I did verify that there is no hardware problem. My laptop is dual boot and when I boot the other operating system, the wired network works without problems (as does the wireless.)My Ubuntu version is Ubuntu 10.04.1 LTS. My kernel version is 2.6.32-25-generic i686. I hope anybody can help me getting my wired network working again.
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Jan 22, 2010
I successfully set-up an FTP server, that worked great and perfectly, but after restarting the computer, it has stopped working.None of my router's settings have changed. I restarted the vsftpd process.
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Feb 25, 2010
pulled the wireless USB adapter out of the back of my laptop when I was using it. I plugged it back in and it can see my wireless network, but it can't connect. Everytime it tries, it just shows the connecting icon on the top bar for a few minutes and then says that the network has been disconnected.
I've tried uninstalling and reinstalling the USB adaptor, but nothing I've done seems able to fix the issue. Anyone know how to fix this?
The USB adaptor I'm using is a Trendnet TEW-424UB
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Apr 29, 2010
I have had ubuntu about a month now and everything has worked great up until now, I was surfing the web and all the sudden I lost connection. I tried to connect to the signal but got nothing so I did a reboot. After the reboot my wireless signal didn't show up. i right clicked the connection icon on the top taskbar and the enable wireless is blacked out to where i cant click it.
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May 20, 2010
i installed and ran System Profiler & Benchmark ran a test. then i rebooted and turned off ACPI/PowerNow. at this point i realized my network card had gone down so i went back an turned the ACPI on. nothing changed.
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Jun 30, 2010
I have a Thinkpad T400 notebook that dual boots windows 7 and Ubuntu 9.04. My wireless has worked both in windows and ubuntu for the past several months. However 2 days ago, the wireless in ubuntu stopped working. I think this may be a result of trying to set up a static eth0 connection between my laptop and an embedded board, but I dont see how messing with eth0 would stop the wlan from working.
Symptoms: When I left click on the network connections icon in the tray, all it lists under "Wireless networks" is "device not ready". Needless to say, there are no networks available to connect to. Also the wireless is working fine under windows.
[Code]...
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Aug 2, 2010
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.What could have occurred, and how might I troubleshoot it?
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Aug 4, 2010
Just recently the wireless stopped working on Ubuntu 10.04. The machine is AcerOne AOA-150. I did notice recently the wireless would stop working, and I would need to either 1) reboot 2) switch the wireless off by moving the switch from left to right in front of the laptop.
However, this time nothing is working. I've provided some detail and if more information is needed, let me know.
LSPCI:
00:00.0 Host bridge: Intel Corporation Mobile 945GME Express Memory Controller Hub (rev 03)
00:02.0 VGA compatible controller: Intel Corporation Mobile 945GME Express Integrated Graphics Controller (rev 03)
[Code]....
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Apr 30, 2011
On 10.10 my wireless card worked out of the box. Now on 11.04 it stopped working after the update!. My card is Atheros AR5001.
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Jun 17, 2011
Been searching for hours and looked at several other threads but still can't figure this out. We have 4 folders being shared from a Ubuntu 10.4.2 LTS Server using Samba. A couple days ago two computers in the office lost access to these shares. The other computers in the office are fine. So far as I know nothing has changed on the server. I can putty into the server still but I can't map a drive or open a window through run (\server_nameetc).
I've also tried disabled iptables on the server and windows firewall on the the windows xp machines. Still no luck. What am I doing wrong? Like I said, so far as I know there have been no changes to the server whatsoever. One day it was working and the next it just stops.
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