I just receive critical error: All management server resource pool in scom 2012 management console.
Alert detail:
Alert subscription data source module encountered errors while running: Alert subscription data source module was unable to find alerts that match the subscription because of database errors.
The following error(s) were encountered:
Exception Message: ExecuteScalar requires an open and available Connection. The connection's current state is closed.
One or more workflows were affected by this.
Workflow name: Subscription3f818422_f4a1_42aa_b1b3_8bc14eb54cd8
Instance name: Alert Notification Subscription Server
Instance ID: {E07E3FAB-53BC-BC14-1634-5A6E949F9230}
Management group: SCOM_2012
What is problem and how to fix it ? I haven't changed any setting in scom !!