When attempting to connect Advanced Threat Protection (ATP) to the Symantec Endpoint Protection Manager (SEPM) via the controller connection, the connection fails. Browsing to the RMM Webservices website (https://sepmip:8446/sepm) does not display the website even though the services are running.  

SEPM returned a non-200 HTTP response 

RMM Webservices were previously disabled by running ConfigSEPM.bat as outlined in HOWTO111804.  

Re-enable SEPM RMM Webservices using the following steps:

1. Open a command prompt with admin privileges and navigate to the \Program Files (x86)\Symantec\Symantec Endpoint Protection Manager\Tools folder
2. Run the following command                                                                                                                                                                                                                 -ConfigSEPM.bat -RmmWS:ON 
3. Restart SEPM and SEPM webserver service.