Yes, an intranet user usually connects through a firewall, like Microsoft ISA Server, etc. (from office or public networks). I think it is a 'keep-alive' related issue, because if user sends a messages to rooms every 5-10 sec., no disconnections happens.
Please check an attachment, there is only one user in chat room, connection time is '07:45:26', disconnection on '07:46:36,430'
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