VigilEnt Security Manager had been working just fine and suddenly gave this error on login.
VigilEnt Security Manager 4.x
Error: 'A data access error occurred (Error code 0) Error information: [Microsoft][ODBC SQL Server Driver][SQL Server] Warning: Fatal error 9001 occurred at date/time' when logging into the VigilEnt Security Manager console.
This error is produced when the SQL Server service has stopped.
To resolve this issue, stop and restart the SQL Server service and then stop and restart VigilEnt Security Server service. This can also be resolved by rebooting the SQL server.
For information on stopping and restarting services see NETIQKB25651