If you open SSMS (Sql Server Management Studio), then open the task manager, which you will notice, even if your Windows server is 2012 and 64 bits and your SQL installation is 64 bits, SSMS is a 32-bit application. You most likely did what you did and updated the machine.config file in the following directory, which is for the 64-bit .NET Framework:
C: \ Windows \ Microsoft.NET \ Framework64 \ v4.0.30319 \ Config
you must also update the configuration of the 32-bit structure:
C: \ Windows \ Microsoft.NET \ Framework \ v4.0.30319 \ Config
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