HTTP Error 500 Internal server error

Error Message

Connecting to the Workflow Manager Server Object URL (http://<server>/wmrest) returns the following error message:

"HTTP Error 500 Internal server error".

Cause

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.

Solution or Workaround

1. Log in to the server and open IIS Manager.
2. On the Connections pane, expand the server node and click 'Application Pools'.
3. Right-click and select 'Advanced Settings' on the application pool that is being used for the 'WMREST' site. It is recommended to use the Classic .NET Application pool.
4. On the Advanced Settings dialog box, change 'Enable 32-bit applications' to 'True'.
5. Click OK.
6. Restart IIS and connect to the Workflow Manager Server Object URL in a Web browser.