KB2756920 causes IIS to crash

I have faced a recent issue on OWA of Exchange 2010 installed on windows 2008 R2 on various server.

The issues caused OWA – Blackberry – Out of office and autodiscover to totally crash and the application log was filled with errors similar to the below

EventID: 3
Source: System.ServiceModel 3.0.0.0

WebHost failed to process a request.
Sender Information: System.ServiceModel.ServiceHostingEnvironment+HostingManager/30542218
Exception: System.ServiceModel.ServiceActivationException: The service ‘/EWS/exchange.asmx’ cannot be activated due to an exception during compilation. The exception message is: Method not found: ‘System.String System.ServiceModel.Activation.Iis7Helper.ExtendedProtectionDotlessSpnNotEnabledThrowHelper(System.Object)’.. —> System.MissingMethodException: Method not found: ‘System.String System.ServiceModel.Activation.Iis7Helper.ExtendedProtectionDotlessSpnNotEnabledThrowHelper(System.Object)’.
at System.ServiceModel.WasHosting.MetabaseSettingsIis7V2.WebConfigurationManagerWrapper.BuildExtendedProtectionPolicy(ExtendedProtectionTokenChecking tokenChecking, ExtendedProtectionFlags flags, List`1 spnList)

After some troubleshooting removing KB2756920 solved the issue.

Although I only faced the issue with Microsoft Exchange, this is rather an IIS issue and I guess it could affect any other web-based application.

I have been working in IT consultancy and solution integration since 1998 and I consider myself lucky to be, one in a few, making a living out of my passion. I am also member of the famous Experts Exchange (profile here) online community where I try my best to share what I have learned along the road.

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