Cannot answer the question, but I can tell you where to look to see why the system is no longer on the network.

On the box which is no longer seen by the rest of your network:

First, check to see that the Ethernet device you are connecting to the network is up and configured.  Use ifconfig for that.

Next, make  sure the routing tables are correct.  Use route for that.

Next, make sure you can get outside.  Easiest way is to go to a remote web page.

Next, instead of using ‘localhost’ as the name for the machine, try using its externally-visible IP address.  E.G. if it is 10.5.1.2 then use 10.5.1.2 instead of localhost for one of your ‘inside the box’ tests.

All that will verify that the box is on your network and listening to the external IP address to serve requests.

Now, from a remote machine, try to ping that machine.  If it answers, then you can reach it and things should have been working.  Note also that pinging or tracerouting with a port number can reveal listening issues as well.

If you know when the change from working to not working happened, do a find from /etc for any files which have changed since that ‘known time’  (e.g. find /etc –newer <file with older-than date>)

Of course, this is all generic stuff, Lisa just said something very ubuntu-specific.  See her info first, but for everyone else the above might help in time of need J

Rusty

From: plug-discuss-bounces@lists.plug.phoenix.az.us [mailto:plug-discuss-bounces@lists.plug.phoenix.az.us] On Behalf Of Joe Gibbs
Sent: Wednesday, May 02, 2012 10:38 AM
To: plug-discuss@lists.plug.phoenix.az.us
Cc: Joseph Gibbs
Subject: Ubuntu Desktop vrs Server versions

Hi

I have a small Dell box that I have been using off and on for misc work related sw testing (started with v 9.x Desktop).

I need to ramp up my personal training (as I am looking for work at the moment) and have a question for the group.

Currently I am running 12.04 Desktop version with Apache, MySQL, OpenSSh and some other server packages installed. I will be installing Oracle next week for my next training project. However after the 12.04 upgrade I find that I can not access the Desktop Ubuntu machine from anything on the local network. I can access apache, mysql locally. A local ssh connections works just fine. Just can't do any of them from outside the box from anything on my home/local network.  I don't think there are any running firewalls, so I am discounting that as an issue. 

Would a fresh install of the Server version be a better long term solution for working with those type of packages, or should I stick with my 4x upgraded Desktop version?

and

Does anyone have any suggestions as to what I can look into to resolve my network connection issue ?

Thanks

Joe Gibbs