Server is in single user mode

after successfully backing up a number of my databases I get

• 3:03:15 AM : ERROR: Failed to backup “xxxx” database with “Full” backup type: Login failed for user ‘userxxxx’. Reason: Server is in single user mode. Only one administrator can connect at this time.

why is this happening?

Hi Peter,

To investigate this case we need more details.

Could you please tell us are you able to perform a backup manually via SQL Server Management Studio?