Problem:
CBL_DEBUGBREAK does not work when COBOL is called from a .Net WebService.
In this case the .Net Web Service is C# based and calls COBOL via a Platform Invoke. The COBOL is unmanaged and issues a CBL_DEBUGBREAK call.
The debugger never appears.
Resolution:
At a Net Express Command Prompt you can issue "cblcored -i". This sets up some security setting so that the Service can communicate with the desktop so that the debugger will start.