22. April 2013 · Comments Off on The RPC_S_SERVER_UNAVAILABLE error (0x6ba) was thrown by the RPC Runtime process · Categories: Office365 · Tags: , , , ,

I”m working on a Office365 Migration for a client that has an Excahange 2010.  Encountered some some migration issues.  I ran the testexchangeconnectivity.com test for RPC over HTTP, and everything was just fine, excpet for the last test, which returned the dreaded:

“The RPC_S_SERVER_UNAVAILABLE error (0x6ba) was thrown by the RPC Runtime process.”

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The Fix:

Disable IPv6 & Change Hosts file.  Hard code the host file in your CAS & DNS Server (c:WindowsSystem32driversetc)  with the IP, NetBIOS & FQDN of the Exchange Client Access Server (CAS).  When you have an external domain that is different from your internal, you need to hardcode the external FQDN to point to the local IP of your CAS server on the CAS server itself & Primary Domain Controller

Modifying the hosts file to add the local IP address and local hostname  of the Exchange server fixed the problem for us.

#127.0.0.1 localhost

#::1 localhost
10.1.1.2 mailserver
10.1.1.2 mailserver.domain.local

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