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CentOS 6.4 on old PC not connecting

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On an old server (Dell PowerEdge SC1420, now without RAID) I have CentOS 6.4 installed, up, and running -- but it keeps failing to connect for some reason ....

NetworkManager applet 0.8.1 runs blue rings around in the panel for a while, then reports itself disconnected. It also offers a pseudo-choice, if I right-click, between Wired Connection and eth0; in fact, the cable to the router is the only connection the machine has or has ever had.

I've tried such things as I could find to get a connection, in vain. I've tried replacing the cable.

If there's a good fix, I'd like to get my wife running CentOS, because it's one obvious choice for her to have against such time as I'm gone. (I don't at all claim to be the Oldest Subscriber, but I am at an age such that I would be irrational not to plan for such contingencies.)

What new way can I try to get this beast online?

posted May 18, 2013 by anonymous

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1 Answer

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If it shows eth0 in the networkmanager window, then it appears that it can see the ethernet card.

What is the output from ifconfig?
What does /var/log/messages say when you are trying to connect?

answer May 18, 2013 by anonymous
OK, I got lots of output from ifconfig, and tons from /var/log/messages; so what should I look for??
(a) Post the output from ifconfig
(b) type this: tail -f /var/log/messages
(c) Now tell networkmanager to connect.
(d) Post everything that shows up from that point until the connection attempt fails.
Remember the problem machine can't even send *me* things over my LAN; what's more, I don't seem to see an app for writing them to a CD and sneaker-mailing them to myself.
Hi-yi-yippee-ki-yay! I did ps ax|grep networkmanager ; got a process number; killed it; and wonder of wonders, it put itself online.
I launched firefox, opened a tab to weather, and got today's data ; so it really is online!
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