HTTP session timeouts

It seems like BW users running web reports are constantly getting timed out of their sessions. I'm not certain if the ICM timeout setting in the instance profile (currently set at 1 hour) is the root cause. Some users seems to be timing out within 10 minutes.

We have set 7200 value for rdisp/plugin_auto_logout.

3600 value is set for icm/keep_alive_timeout.

Any solution of this problem?