Physical and Network Driver Problems
Sometimes a UNIX networking problem won’t be in the higher-level services and programs—in other words, there will be times when it’s not the people behind the telephone, but rather the telephone or phone system itself. In order to make this determination, you can use a couple of techniques and commands.
 | Think your server’s locked up? Well, when nothing seems to be working from the network (that is, you can’t Telnet or SSH into the server), you might have to find the UNIX console (the actual keyboard and monitor that is connected to the server itself) and log in from there. If the console isn’t responsive, ... |
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