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Telnet connection repeatedly closes

EXPERT RESPONSE FROM: Shahar Mor

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QUESTION POSED ON: 15 July 2008
Has anyone ever had this problem? The Telnet connection keeps closing - even if a job is running. It seems to go down every few minutes if no activity and returns back to signon screen. When I boot in safe mode with network support, I get same problem. The IBM rep states that there must be a service running. So, we sent trace dumps to IBM with no response. We have shut down every nonessential service we can find, but we still have the same problem.

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Sometimes there is inactivity timer somewhere on the network.

Lower the TCP keep-alive. The keep-alive frame may reset the inactivity timer. Some network components appear to ignore keep-alives.

The iSeries TCP keep-alive is set using the CFGTCP command, option 3. The value must be less than half the value of the idle timer. For example, if the firewall idle timer is 60 minutes, the keep-alive should be set to 29 minutes or less.

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