NetworkManager -- and what else??

[Beartooth]

The man pages are pretty sparse. But it often fails, at least 
here. What are you supposed to do, in order to try again to connect? (Say 
you know you *have* a connection; your other machines are doing fine...)

There's a launcher that looks like two monitors on a vertical 
pipe; right-click and get its Properties, and it tells you it runs the 
command usr/bin/system-config-network. Left-click, give it root's 
password, and it shows you all sorts of nice GUI stuff including buttons 
to 'activate' or 'deactivate' your ethX. Sometimes it works. Sometimes it 
even makes a connection after NM has failed.

Often both fail. Then what?