This monitor checks the status of the database mirroring session as reported by Microsoft® SQL Server™. This is performed by running a query against the master database of the SQL Server instance and returning the state of the database mirroring session. If you receive an alert from this monitor, an action is required in order to bring the database mirroring session back to an operational state.
Unhealthy state indicates that the SQL Server™ database mirroring session is not in operational state. The possible states are detailed below:
Mirroring Partners State
MOM Health State
This is normal operational state. Mirroring Partners are synchronized and mirroring is performing normally.
Mirroring Partners are out of sync.
To resolve the issue try the following:
Make sure mirroring configuration is complete and mirroring process is up and running.
Check physical link between Mirroring Partners.
Configure firewall rules on both Mirroring Partners according to endpoints configuration.