Outlook Web Access losing connection intermittently

I have recently installed a new Exchange 2007 mailserver and a number of users are complaining that the Outlook Web Access keeps freezing and not responding.  I have confirmed that the internet connection is constantly up at both ends, and for the most part it is very fast but I have recreated the issue a few times now:

If the screen is open at the inbox for a while I can move from folder to folder without an issue, but once and a while if I select the "Check Messages" button  I get an IE7 loading circle then an error saying:

Your network connection is unavailable.  Please reconnect and try again.  If the problem continues, contact technical support for your organization."

If I refresh the screen a few times it comes back, I can also click on other folders and view the contents of them without issue, but the inbox remains blank until it feels like coming back.

The internet connection is up during this error, and there are no errors apearing in the servers event logs.

Any help would be appreciated.
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tonyperthAsked:
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SteveIT ManagerCommented:
Check that your Exchange server is fully patched and everything is configured correctly as per

http://searchexchange.techtarget.com/tip/0,289483,sid43_gci1231470,00.html
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tonyperthAuthor Commented:
Thank you,

Unfortuantely I can only apply up to Service Pack 1 as my backup software does not support Service Pack 2, that said I cannot find this issue described in any of the things fixed by SP2.

The session is not timing out, as it continues to work and does not require reauthentication it simply stops showing the contents of the inbox for a while.

So I am still stumped, any other ideas? :-)
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SteveIT ManagerCommented:
have you tried running a continual ping to the server (start, run, cmd, ping serverip -t) as this willl keep a connection open to the server
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tonyperthAuthor Commented:
yep, that's how I know it is not an internet issue.
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tonyperthAuthor Commented:
It seems that I have an issue with routing, due to using a team on the exchange server.  i have disabled the team and it is workign ok now.

thank's for the help
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