DOCUMENT:Q280096  01-JUN-2001  [exchange]
TITLE   :XCCC: Unable to Connect to Exchange Server By Using POP3
PRODUCT :Microsoft Exchange
PROD/VER::5.5
OPER/SYS:
KEYWORDS:kb3rdparty

======================================================================
-------------------------------------------------------------------------------
The information in this article applies to:

 - Microsoft Exchange Server, version 5.5 
-------------------------------------------------------------------------------

SYMPTOMS
========

When you try to connect to Exchange Server by using Post Office Protocol 3
(POP3), you may be prompted for logon credentials numerous times, and you may
not be able to log on successfully.

CAUSE
=====

This issue can occur if you have installed the Norton Anti-Virus 2000 program on
the computer and the Popproxy.exe service is running.

RESOLUTION
==========

To resolve this issue, disable or remove Popproxy.exe.

MORE INFORMATION
================

If you connect to port 110 by using telnet, you receive the following banner:

   18:33:22 POP3: 18:33:23 [rx] +OK POP3 server ready

   POP3: 18:33:23 [tx]

However, this banner is not the Exchange Server POP3 banner.

Additional query words:

======================================================================
Keywords          : kb3rdparty 
Component         : POP3
Technology        : kbExchangeSearch kbExchange550 kbZNotKeyword2
Version           : :5.5
Issue type        : kbprb

=============================================================================

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS
PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND.  MICROSOFT DISCLAIMS
ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  IN NO
EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR
ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL,
CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF
MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES.  SOME STATES DO NOT ALLOW THE EXCLUSION
OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES
SO THE FOREGOING LIMITATION MAY NOT APPLY.

Copyright Microsoft Corporation 2001.