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Microsoft KB Archive/256221

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Knowledge Base

XCON: Exchange Server 5.5 POP3 Clients Cannot Authenticate on Server Running Windows 2000 Advanced Server

Article ID: 256221

Article Last Modified on 10/28/2006


  • Microsoft Exchange Server 5.5 Standard Edition, when used with:
    • Microsoft Windows 2000 Standard Edition

This article was previously published under Q256221


Post Office Protocol version 3 (POP3) clients may be unable to authenticate with Exchange Server 5.5 if it is running on a Microsoft Windows 2000 Advanced Server-based computer. The client generates the following error message:

"Your User name or password was rejected"
Error Logon Failure Port 110 ssl 0x800ccc90.

The following event 11310 may also be logged in the application event log of the server:

pop3 unaccepted and unauthenticated user.

Messaging Application Programming Interface (MAPI) clients can log on as the POP3 user with no problem.

If you telnet to port 110, you receive the following error message:


The application event log also contains event 11310 "LOGIN FAILURE" followed by event 11103 "losing connection."


To resolve this problem, upgrade to Exchange Server 5.5 Service Pack 3.

Additional query words: IMAP4

Keywords: kbprb KB256221