Enrollment Point Control Manager detected that the Enrollment Point is not responding to HTTP/HTTPS requests. The http status ...

%11Enrollment Point Control Manager detected that the Enrollment Point is not responding to HTTP/HTTPS requests.  The http status code and text is %1, %2.%12

Possible cause: Internet Information Services (IIS) isn't configured to listen on the ports over which Enroll Service is configured to communicate. 
Solution: Verify that the designated Web Site is configured to use the same ports which ENROLLSRV is configured to use.

Possible cause: The designated Web Site is disabled in IIS. 
Solution: Verify that the designated Web Site is enabled, and functioning properly.

For more information, refer to Microsoft Knowledge Base.
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