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OWA 2010 - Error Code 64

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OWA 2010 - Error Code 64 - 15.Sep.2010 7:22:27 PM   


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Joined: 15.Sep.2010
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Hi Guys,

I have recently created a new domain 2008r2 with a single Exchange 2010 SP1 server running Hub, CAS and mailbox.

I am reverse publishing OWA, Outlook Anywhere and ActiveSync through a single TMG 2010 SP1 server.
Reverse publishing OWA rule: SSL and basic auth between Exchange and TMG. Externally I am using SSL with Forms Based auth. Outlook Anywhere and ActiveSync are published on a separate IP to OWA.

The problem I am getting when I use OWA externally, is that if I leave the OWA page to sit for roughly 30seconds then try to access another page I get (Error Code 64: Host not available) on teh users end and (Status: 64 The specified network name is no longer available.) on the TMG logs.
I am yet to work out what might be causing this, I hve seen in my searching that people would get this kind of error on ISA 2006 and owa 2007, often solved by turning of compression caching. I have tried this with no success.
I believe this is solely the issue of TMG as when I access OWA internally, so going straight to the Exchange box I never get this problem.

Has anyone encountered this or have any ideas on how to resolve this.

Thanks for any input.
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