Users getting kicked out of sessions

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http://www.unix.com – We have an old (11.11) HP-UX system. A couple of months ago, our customers started having problems with their logins. After sitting idle for roughly an hour, their screens would lock up and they would be kicked out of the system. This happens if they are in the application or on the command line. I have verified that this is happening by leaving a putty session (at the command line) open. I have checked for any kind of "timeout" on the system and cannot find anything. We use SSH (telnet is disabled). I have looked thru the syslogs and the customers' profiles. Please let m (HowTos)