Microsoft KB Archive/256221
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:
The following event 11310 may also be logged in the application event log of the server:
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