Adding new Web Prevent server problem to Enforce, status unknown

Hello.   I have installed DLP detection server on a Windows 2106 server and im trying to add it as a Web Prevent detection server on our DLP 15.1 environment.    The server status is " ? Unknown".    Do I have to restart a specific DLP service on our Enforce Sever to have the Enforce server see it as "Status Running"?

CAn you let me know exactly which service need restarting?  I tried recycling the "DetectionServerController Status" on the Enforce server through Server Overview page, but it doesnt seem to change the status of the new Web Prevent server as "Running"

Thanks in advance.