Event ID - 1011

Event Id1011
DescriptionAuthentication attempt from <name> to <host name> has failed with error <text>.
Event InformationAccording to Microsoft:
This is a rare event that indicates that the authentication attempt from the client machine with the specified IP Address failed. Check the error code in the Description section of the event to understand the underlying cause of this error. This can be caused by a misconfiguration on the client or a problem with the IMAP4 service on the server.
Check the configuration of the client and the account information. Investigate the environment, and observe any patterns (for example, does this event always show a specific IP Address). Also, check the application log for related messages. Proceed accordingly.
Reference LinksExchange (IMAP4SVC)

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