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RPC Minimum Connection Timeout Check


By default, Outlook Anywhere opens two default connections to the Exchange CAS called RPC_InData and RPC_OutData. The Outlook Anywhere client to server used a default timeout of 12 minutes (720 seconds) of inactivity and the server to the client timeout is 15 minutes (900 seconds).

These default Keep-Alive intervals are not aggressive enough for some of today's home networking devices and/or aggressive network devices on the Internet. Some of those devices are dropping TCP connections after as little as 5 minutes (300 seconds) of inactivity. When one or both of the two default connections are dropped, the connection to the Exchange server is essentially broken and not useable.

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Additional resources:

Outlook Anywhere Network Timeout Issue