Assume that you use a Maintenance plan that runs on a recurring schedule as a SQL Server Agent job to back up a database in Microsoft SQL Server 2016 or 2017. If the credentials of the SQL connection for the job are a SQL user name and a password, the job finishes successfully. However, error entries that resemble the following entry are logged in the SQL Server log:
DateTime Logon Error: 18456, Severity: 14, State: 8.
DateTime Logon Login failed for user 'UserName'. Reason: Password did not match that for the login provided. [CLIENT: <LocalMachine>]
Note If the plan is run by Windows authentication, the job finishes successfully without having error entries logged in the SQL Server log.
This issue is fixed in the following cumulative updates for SQL Server:
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