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AIX 6.1 strange Hangs

questil asked
Last Modified: 2012-05-12
I have AIX 6.1 machine that hangs lately very often.
When it hangs it doesn't response when I try to ssh the server, but to telnet it I can enter user & password and that's all; it doesn't proceed after I type the password. it's also respond the same when I try to login from the console (command line login)
It hangs this morning, and after hard reset I checked the errpt and there was nothing there that might provide a lead to the cause.
After the reboot I left an open ssh session to this server and now it hangs again (after 4.5 hours): I can't open new sessions, but the session I left open is alive.
Naturally,  I checked the errpt again, and there was nothing there that might provide a lead to the cause, the last entry was from 4.5 hours ago after the last boot this morning.

Any idea how to troubleshoot this problem and what might cause it?

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