The password of the Foglight database user has expired or the configured FMS database is linked to another database
The Foglight database user does not have sufficient privilege to access the "foglight" schema.
The listener port changed after the Foglight installation finished.
Password for credential used to start SQL Server service had changed so SQL Server repository was down.
If the database is linked to another database, Foglight is not able to use it, due to wrong credential.
Make sure the the database is not linked to another database.
Assign the necessary privilege to the Foglight database user to access the "foglight" schema.
Make sure the listener port is correct set in the server.config file. To get the listener status/details run the below command from the listener control utility:
Update the password under the Log On tab of the Service used to start SQL Server.