Posted by: Ian | July 10, 2012

Exchange 2010 Apphost and OWAAUTH.dll failures

Had a client recently with issues on one of their Exchange 2010 servers.

Symptoms includes WAS eventlog errors with APPHOST issues along with owaauth.dll errors which meant you couldn’t user the EMC with on the server.

Two things I did to fix it:

Copy the appplicationhost.config from and overwrite the existing one in system32/config
Also copy the extrace.dll from the Exchange/Bin dir and put it in system32.

Couple of IISRESETs later and all is happy.

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