internet connection no longer working

clark923

name and version number of the Linux distro you are using? Ubuntu 10.04

I am connected to my other computer via an ethernet switch hard wired

When you are attempting to reach the internet can you see an icon

or message that states that you are connected to a network? No

it used to work just fine and I may have accidentally changed some setting

can you please help?

Andrew

marc

Might sound stupid but... check that the wire is still connected (unplug and plug it back in )

Regards

Goineasy9

I don't know if it was a mistake or not, but I removed your duplicate post, so, any answers will be in this one thread.

mfillpot

It the connection is not showing in the network manager then you may have changed the network addressing from a predefined static or dhcp/dynamic address into an incorrect static address which would cause it not to talk to the router.

After you check the physical connection I recommend for you to check your network settings and change the ipv4 setting method to Automatic( DHCP).

odlevakp

If in the output of this command

cat /var/lib/NetworkManager/NetworkManager.state

you'll see that the networking is disabled, delete the NetworkManager.state file (and restart the service)

sudo rm /var/lib/NetworkManager/NetworkManager.state
sudo service network-manager restart

mfillpot

I am replying for Andrew.

There was no wired connection and adding one did not bring it back.
But the physical connection is active and activity lights are flashing.

so, there may be a deeper issue, I think it would be best if you gnome guys help him through the deep diagnostics.

mfillpot

Please open the terminal from Applicaions->Terminal and input the commands that Pavol gave in his last post then tell us what happens.

Goineasy9

One other thing, make sure under the wired connection, you check the box that says start network automatically. If that box is not checked it may be the reason for network manager not starting. Although as said in a previous post by Pavol:

sudo service network-manager restart

should start the networking.

clark923

doesn't sound stupid, I did check it & unplugged it and plugged it back in & it still doesn't work
thanks though

clark923

sorry, I'm a newbie ... how do I do this?

saqman2060

Just some additional procedures, unplug your switch and plug it back. Then check that your router is working properly, like receiving activities, this means it is connected to your ISP. If not, restart your router by powering it off and on. Once you've done that, apply the procedures in your terminal as stated by the previous posts.

saqman2060

To input the code, open your terminal from applications>accessories>terminal

Then in the terminal, type as follow

#sudo service network-manager restart

The system will ask for your password, and once given correctly, your ethernet device will be restarted.

clark923

sorry, I'm a newbie ... how do I do this?

clark923

unfortunately, there was no change

mfillpot

clark923 wrote:

unfortunately, there was no change

Then you modified something even deeper in the system. Can you tell us where you made the changes that caused your network communications to fail?

odlevakp

Strange... could you open your Terminal application as mentioned before and paste here the output of these commands (some were already mentioned, but bear with me ):

status network-manager

network manager should be running...

cat /var/lib/NetworkManager/NetworkManager.state

everything enabled there

ifconfig

a network interface should be up

route -n

quick look on your routing table

cat /etc/network/interfaces

only loopback should be present

nslookup linux.com

dns is working... i know I've posted a lot of commands here, but the output hopefully will give the ppl in this thread a better insight on the problem...

clark923

1) network-manager start/running. process 2432
2) no such library or directory
3) ifconfig
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:353466 errors:0 dropped:0 overruns:0 frame:0
TX packets:353466 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:17789052 (17.7 MB) TX bytes:17789052 (17.7 MB)
4) route -n
Kernel IP routing table
Destination Gateway Genmask Flags Metric Ref Use Iface

5) cat /etc/network/interfaces
auto lo
iface lo inet loopback

6) nslookup linux.com
^[[B^[[B;; connection timed out; no servers could be reached

odlevakp

Ok, this commands might help (I'm assuming that the cable is connected, interface is called eth0 and that there is a dhcp server somewhere on your network):

sudo ifconfig eth0 up
sudo dhclient

clark923

sorry, I have no idea

clark923

response from system:
Listening on LPF/eth0/00:30:1b:81:8e:9c
Sending on LPF/eth0/00:30:1b:81:8e:9c
Sending on Socket/fallback
DHCPDISCOVER on eth0 to 255.255.255.255 port 67 interval 6
DHCPOFFER of 192.168.1.68 from 192.168.1.254
DHCPREQUEST of 192.168.1.68 on eth0 to 255.255.255.255 port 67
DHCPACK of 192.168.1.68 from 192.168.1.254
bound to 192.168.1.68 -- renewal in 34729 seconds.

also, not sure what this means, but the system will automatically check the "work offline" in the file menu every time I re-try getting onto the internet (mozilla firefox)

clark923

just re-started the computer and I am online again

THANKS VERY MUCH
All of your help is very much appreciated!
Andrew

clark923

hopefully one more quick question
I just noticed that the "work offline" file menu is re-checked every time I go into my browser
how do I get it to stay "online" ?

saqman2060

cat /etc/network/interfaces

only loopback should be present


shouldn't the ethernet be present too?

saqman2060

clark923 wrote:

hopefully one more quick question
I just noticed that the "work offline" file menu is re-checked every time I go into my browser
how do I get it to stay "online" ?

Just uncheck it, that should do the trick.

clark923

yes, I understand that I need to uncheck it, but how do I get it to stay unchecked?
it used to...

asedt

clark923 wrote:

I just noticed that the "work offline" file menu is re-checked every time I go into my browser
how do I get it to stay "online" ?

What version of Firefox are you using?

Maybe NetworkManager don't give the right online status to Firefox. There is a workaround here:

http://ubuntuforums.org/showthread.php?t=851542#8

odlevakp

saqman2060 wrote:

cat /etc/network/interfaces

only loopback should be present


shouldn't the ethernet be present too?

iirc it's only present on a server installation, where the interface has an entry like

auto eth0
iface eth0 inet dhcp

for dhcp, on a desktop system this should be handled by the network manager daemon

atreyu

clark923 wrote:

yes, I understand that I need to uncheck it, but how do I get it to stay unchecked?
it used to...

I had the this same problem w/Firefox (but in Fedora, not Ubuntu), and I tried changing a Firefox config parameter that supposedly fixed it - but it didn't. what eventaully worked for me (as Aron hinted at) was to upgrade to the latest version of Firefox. Note that my distro's repo did not have the latest version of Firefox - I had to manually grab it from http://www.mozilla.com/en-US/firefox

hth,

-bill

clark923

I did download it but (and I know this sounds dumb, but I am very unfamiliar with how to do things with Linux/Ubuntu) how do I install this. It is currently saved on the desktop.

atreyu

clark923 wrote:

I did download it but (and I know this sounds dumb, but I am very unfamiliar with how to do things with Linux/Ubuntu) how do I install this. It is currently saved on the desktop.

sorry, i just noticed that you responded to this...

Believe me, it does not sound dumb.

1. Open up a terminal (e.g., from the Panel along the top/bottom of the screen, select Applications > System Tools > Terminal or, if you are using Gnome, you can press Alt+F2, which brings up a Run Application window - type gnome-terminal then click Run.

2. Change dirs to your Desktop directory (where the file you downloaded is), e.g.:

cd ~/Desktop

3. Make sure you see the file you downloaded, e.g.:

ls firefox-*
firefox-4.0.1.tar.bz2

4. Unpack the archive to the /usr/local dir, e.g.:

tar -C /usr/local -jxf firefox-4.0.1.tar.bz2

NB: The above cmd assumes you are root (or own /usr/local) - otherwise, you'll have to use sudo, if your system is set up for that, e.g.:

sudo tar -C /usr/local -jxf firefox-4.0.1.tar.bz2

NB: if your firefox tarball ends in ".gz" instead of ".bz2", use -zxf instead of -jxf

5. See if you can run it, with this simple test:

/usr/local/firefox/firefox -version

If it works, you should get back Mozilla Firefox 4.0.1 Copyright...blah blah blah
If instead you see libstdc++/GLIBCXX errors, then your system is missing required libraries - report back to us.

If it works, then there are various ways to make it your default, but first see if it works for you...