Assume that you run a database backup on a secondary replica in an Always On availability group in Microsoft SQL Server 2016 or 2017, you may receive the following error message:
Error: 9003, Severity: 20, State 1
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
This issue is fixed in the following cumulative updates for SQL Server:
About cumulative updates for SQL Server:
Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. Check out the latest cumulative updates for SQL Server: