had issue and OpsCenter and support was not able to replicate issues so they asked for backup copy of database. But they were able to restore it but not able to connect it.
Login screen had this error message: Error occurred while connecting to the OpsCenter Server. Please ensure that the server is running.
I found that you have to update variable string to current hostname. File name INSTALL_PATH\OpsCenter\server\config\security.conf
Any feedback is welcome
$ type INSTALL_PATH\OpsCenter\server\config\security.conf
#Last Updated on
#Mon Oct 07 12:09:07 CEST 2019