I'm experiencing the same issue again, but I still don't know how to determine which user account is the culprit.... Can anyone help?

Once you have your link server created you can just select catalogs for the linked server you created and drag and drop to the window. It must be in...

That was going to be my next suggestion:

Rebuild the Maintenance Plan

I'm still currious if the connection string has the correct information

have you verified the connection string under job properties?

Dude!!! It worked..... Why do I have to specify the port number on the previously mentioned workstations?

I included it as an attachment, but I can see that it wasn't uploaded. Here ya go

A network-related or instance-specific error occurred while establishing a connection to SQL Server....

Does it have something to do with the installation process?

Also, ensure the user is mapped to the DB.

Does the user you are trying to use have Grant (Connect SQL) to the default DB for that user.

I was actually talking about the SQL SERVER Login.... I can see the computer that is trying to make the connection but not the account.

With that being said, what is the problem with conducting the testing on a test db that is not part of the mirroring session. If it's an exact copy,...

why not restore a backup on the principle B and let them conduct the testing on that?

Will the changes be reversed before you fail B as principle back to A?

@wondermorris8

I am experiencing the same issue... Did you figure out how to find the user\account?

The errors seem to be very sporadic. Sometimes hours between, while other times minutes apart.