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Exchange 2013 CU2 Error Service WAS Failed To Reach Status Running

During a recent test install of Exchange 2013 CU2 I came across the following error while applying the update.

Set-Service W3Svc -StartupType Automatic
Start-SetupService - Servicename W3Svc
Was run Server WAS failed to reach status Running on this server

Was run Server WAS failed to reach status Running on this server
This issue is down to the WWW service not starting. the reason it will not start is down to the ApplicationHost.config file being corrupt. To confirm this launch IIS 7 and browse to the application pools. You will see the following error.

Exchange 2013 cu2 error

Applicationhost.config line number 1
Error Configuration file is not well formed XML

The resolution to this error is quite simple. On your server browse to the following location.


Then in the random number folder copy the backed up applicationhost.config to the following location.


Overwriting the corrupt file. You will now be able start start the WWW services and its dependencies.

corrupt application host config server 2012


Tags: CU2, Exchange2013

Allen White

Allen is an IT Consultant and holds the following accreditations. MCSA, MCSE, MCTS, MCITP, CCA, CCSP, VCP 4,5, 6 and HP ASE, AIS - Network Infrastructure.

Comments (1)

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    Agreed, this was an enormous help! In the middle of a long drawn out migration from Exchange 2007 to 2013, thought I was going to have to scrap the whole thing and start over.


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