You get the following warning when trying to run "service SymantecDLPDetectionServerService status" in RHEL
Warning: The unit file, source configuration file or drop-ins of SymantecDLPDetectionServerService.service changed on disk. Run 'systemctl daemon-reload' to reload units.
RHEL
This can happen if the links are missing or broken under /etc/init.d folder. Under this folder you should see a link to each of the service names that points to the .sh script in the Services folder in /opt/Symantec/DataLossPrevention/<DetectionServer or EnforceServer>/Services/.
This can be corrected by recreating or fixing the links in the /etc/init.d folder.
To create the link you can use the following example. Please do correct this to whatever service name you are trying to fix.
ln -s /opt/Symantec/DataLossPrevention/DetectionServer/Services/SymantecDLPDetectionServer.sh SymantecDLPDetectionServerService
Once you address this you should be able to run "service SymantecDLPDetectionServerService status" successfully.