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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