Yesterday Microsoft released a patch MS13-04[KB 2756920] which is causing extensive issues with Web[.Net] related applications.
Windows 2008 R2 RTM customer are mainly affected by this patch. The following exception is thrown after installing KB2756920 on Win7/Win2k8 R2 RTM when any WCF service is hosted on IIS using HTTPS in which the machine has a QFE that only contains System.ServiceModel.dll (S.SM.dll) and not System.ServiceModel.WasHosting.dll (S.SM.WasHosting.dll).
Server Error in ‘/SecurtyTokenServiceApplication’ Application
Method not found: