Hello,
You can refer the following technote:
In the event viewer, Event ID: 57860 "An error occurred while attempting to log into the following server... SQL error number: "0011"" is seen when backing up a server with SQL installed.
http://seer.support.veritas.com/docs/264616.htm
Event ID 57860: "An error occurred while attempting to log into the following server..." is reported in the Event Viewer while a backup or restore job containing SQL Server data is run.
http://seer.support.veritas.com/docs/251942.htm
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