ServerAdmin Tool no longer accessible

[Ute Hoffmann]

Hello,
We have a server (Mac Os X Server 10.4.x) which is no longer accessible 
via the Mac OS X ServerAdminTool (remote access via tool).

It used to work. Nothing has changed before it stopped working (what we 
can tell)

The server is up and I can connect successfully via terminal remotely

Is there a way to check, whether the server admintool itself might be 
down (or is this not possible at all, that the tool itself had a crash)?

Can low memory result in the serverAdminTool no longer being responding?

Any other experience why this could be happening?

Error-message: IP does not respond

Webserver is up and running and responding, thus I suppose it cannot be 
a DNS-problem, right?

Thanks for you help,
regards

Ute