Slava Murygin doesn’t like severity 20 errors just popping up for no good reason:
Yesterday I’ve needed to use Dedicated Administrator Connection (DAC) once in a while, and because I have all kinds of notifications in my system, I immediately got an “Severity 20” alert.
As you probably know, Severity 20 Errors “Indicate system problems and are fatal errors” (See books online: https://docs.microsoft.com/en-us/sql/relational-databases/errors-events/database-engine-error-severities?view=sql-server-2017)
Even though “Severity 20” does not indicate any problems with data and belong only to a user process it is still worth to investigate the problem.
Read on to see the cause of Slava’s problem and how there’s no way to fix it in SSMS.