This should never be preformed in production unless there is a specific issue being tested.
To disable SSL and change the port you need to go to the following folder:
C:\Program Files\Symantec\DataLossPrevention\EnforceServer\15.8.00000\Protect\tomcat\conf
Copy server.xml and save it as server.xml.default
Then edit the server.xml change the following to values shown:
Then restart Enforce manager.