Arnold, Try checking the User Access Logs. In our case even we are getting intermittent timeouts. There could be any of the following reasons. 1. When remote (ISP) IP address changes, if you have it configured, the session would time-out. 2. In case you have two Juniper Boxes in Active/Active mode, and if primary/secondary Authentication is being done via one box and Host Checker/Network Connect is creating tunnel via other box....session will time-out.
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