Outlook disconnects from Exchange 2013 several times an hour.

[Edit: I did figure out a little more of the issue. I have figured out that what is causing this is the IIS Application Poll that The Exchange 2013 installer creates by default when installing called "MSExchangeRpcProxyAppPool". The server is recycling the RPC Application Pool every 20 - 30 minutes or so. I have recycling completely turned off  on this pool yet it still restarts which leads me to believe it may be a code problem since it only should recycle if the poll crashes. Short of a bug in the code somewhere, I for the life of me can not find why the Application Pool keeps restarting. This is the only pool out of all the ones Exchange created during installation that is recycling constantly. It is frustrating because our Outlook Anywhere clients keep getting disconnection messages several times an hour because of this. The event logs I listed below are the only event logs I can find that trigger when the pool recycles, so as you can see, they give me no useful information in debugging the problem.]

This problem only applies to outlook clients using RPC over HTTP. ActiveSync, OWA and EWS are working fine.

There is a problem with the RPC over HTTP tunnel on our server. Every 20-30 minutes, sometimes more sometimes less, but usually with in that 20-30 minute timeframe, the RPC over HTTP tunnel drops and all Outlook Anywhere clients get immediately disconnected. IT comes back up very fast and all clients reconnect with in a matter of seconds. Not a huge deal for people using cached mode outlook but all the non-cached mode people (Thin clients are an example are not using cached mode to save diskspace). People using non-cached mode would get a couple errors pop up and outlook stopped working.

The only relevant entries I have found in the exchange server event log are here. These same grouping of events show up everytime the RPC over HTTP tunnel shuts down and restarts. I just can't figure out why its doing it:

1-23-2013 9:21:18 AM RPC Proxy 4 (1)
-- RPC Proxy successfully loaded in Internet Information Services (IIS).

1/23/2013 9:22:41 AM WAS 5138 None
--- A worker process '75832' serving application pool 'MSExchangeRpcProxyAppPool' failed to stop a listener channel for protocol 'http' in the allotted time.  The data field contains the error number.

1/23/2013 9:22:41 AM WAS 5013 None
--- A process serving application pool 'MSExchangeRpcProxyAppPool' exceeded time limits during shut down. The process id was '75832'.

I have been searching for weeks on the problem and all I really have found is that the problem can sometimes be caused by RPC timeouts so I set the RPC timeout on the server to 120 seconds via the registry. That actually helped for about 5 days and then the problem mysteriously came back and I can not get it to go away even though the registry value is still set to 120 seconds on that RPC time out.

Does anyone else know of any thing else that causes this? Its Exchange 2013 on Server 2012 and is a pretty fresh install. Was setup in mid-December.


--Trent W.