SSPI authentication attempt from has failed with error .

Details
Product: Exchange
Event ID: 1069
Source: POP3SVC
Version: 6.5.6940.0
Component: Microsoft Exchange POP3 Service
Message: SSPI authentication attempt from <host name> has failed with error <error code>.
   
Explanation

This error indicates that when a client tried to connect over the POP3 protocol, the authentication attempt with the server failed.

  • The POP3 client is configured to use Secure Password Authentication (SPA)

    and the client is in a different domain than the Exchange server.

  • There may be a firewall between the client and the server that has SMTP

    command filters configured and the AUTH NTLM command from the Exchange Server

    may be filtered.

   
User Action
  • If the POP3 client is in a different domain, configure Outlook Express to

    not use SPA.

  • If there is a firewall, ensure that the SMTP Command Filters on the

    firewall do not filter the AUTH NTLM command.

Look for additional error or warning events in the application log.

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