Admin console stops responding after a while

We just upgraded to Weblogic 8.1.5 . We are having difficulties with the Administrator console. It stops responding after a while. There is no pattern. The restart seems to fix it but restart is very slow as it takes around 2 min to detect each server. So we have to wait for around 16 min (since we have 8 servers) for it to be operational again.
Has anyone seen this problem and can suggest a resolution to this problem.
Thanks
Pankaj Grover

I've never seen this and we've been running 8.1.5 for a while. Have you tried dumping threads to see what the admin server is doing? On UNIX, run 'kill -QUIT <admserv_pid>'. Can't remember if/how this can be done on Win32. I believe Console requests use the weblogic.admin.HTTP execute queue and it only has two threads. Could be that something is blocking those threads leading to this.
I would also look into why your admin server takes 2 minutes to discover your managed servers. That seems unseemly long to me. Mine takes a few seconds at most. Since the Console does cause the admin server to talk to the managed servers, these two things might be related. Maybe you've got some kind of network/DNS lag that could be eliminated.

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