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System Error 1331 is also equivalent to "Logon failure: account currently disabled" error message.

 
Please do the steps in ServerProtect Information Server encounter a backup login error before doing the steps below.

To resolve this issue, you need to delete the disabled computer account in Active Directory Users and Computers.

For more information about this issue, you can visit the following Microsoft KB article:

"Logon Failure: Account Currently Disabled" and "System Error 1331" Error Messages.