RPC over Exchange Help Share on Facebook Post on reddit Tweet on Twitter Share on LinkedIn Home › Forums › Messaging Software › Exchange 2007 / 2010 / 2013 › RPC over Exchange Help This topic has 2 replies, 3 voices, and was last updated 9 years, 9 months ago by Sembee. Viewing 1 post (of 1 total) Author Posts paul_obrienMember Apr 18, 2011 at 6:22 am #154271 OK I have configured the following one mailbox server one CAS+HUB server I still have a 2003 exchange server in the domain. I have removed IP 6 from both systems, created an RPC Application pool in IIS installed re-installed RPC over HTTP numerous times. Still I am unable to connect I constantly get The RPC_S_SERVER_UNAVAILABLE error (0x6ba) was thrown by the RPC Runtime process. Its been a week now of testing ripping hair out and checking Does anybody have any ideas Author Posts Viewing 1 post (of 1 total) You must be logged in to reply to this topic.