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Connecting to the Workflow Manager Server Object URL (http://<server>/wmrest) returns the following error message:
"HTTP Error 500 Internal server error".
This error occurs because the 'WMREST' Web site is set up to use an Application pool that does not enable a 32-bit application to be run on the 64-bit server machine.
Use the steps below to enable a 32-bit application pool in IIS 7.