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Are you using the Authentication Server? It may be the session TTL which is causing the issue:
Try extending it to see if that helps.
Otherwise try using the proxy control for extending the timeout for that domain or destination range.
Thank you Jon,
We use Direct Authentication. It's probably the connection timeout of the default 120 seconds. I didn't want to extend the general setting for it.
I was not really aware of the possibility to override connection timeouts using proxy control. I will add a rule to override the connection timeout setting for certain domains. However I would prefer if such applications sent keep alive messages automatically to prevent idle connections.