Failed to establish connection with web server. Gracefully shutting down OpManager

Failed to establish connection with web server. Gracefully shutting down OpManager

I'm getting this error when trying to start Opmanager.  I already check the lib files & they are OK.  What else could it be.  No changes were made & it just stopped working.  Already restarted & no go either.

                  New to ADSelfService Plus?