Do you know which account is the owner for your SQL Server Agent jobs? Some jobs might be owned by user accounts which can become a problem. What happens if that job owner isn’t around forever and goes away? Will that job just keep chugging along?
Without an existing owner, a SQL Server Agent job will not run. Once a user gets disabled or removed from Active Directory, a job is still going to try running under that user but will begin failing.
Click through to see what kind of errors you might find.