Posted February 5, 201311 yr FPCH Admin We have an ASP.NET 3.5 web app running on Windows Server 2003 IIS. When KB2742596 and KB2756918 got installed all WCF calls to services stopped working and give the error "System.InvalidProgramException Common Language Runtime detected an invalid program." I've found two workarounds - if we remove the patches the WCF calls work again. If we change IIS to say we are targeting the .NET 4 framework the calls work again. Too make things odder - this problem exists on two of our production servers, a cert server - but our development box with the patches installed still works fine. Any troubleshooting help would be greatly appreciated. View this thread Off Topic Forum - Unlike the Rest
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