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Q324025: XCON: POP3 & IMAP4 Clients Can’t Log On, Event ID 13003 Occurs

Article: Q324025
Product(s): Microsoft Exchange
Version(s): 5.5
Operating System(s): 
Keyword(s): kberrmsg
Last Modified: 06-AUG-2002

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The information in this article applies to:

- Microsoft Exchange Server, version 5.5 
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SYMPTOMS
========

Post Office Protocol 3 (POP3) and Internet Message Access Protocol, Version
4rev1 (IMAP4) clients may not be able to log on to Exchange 5.5 Server.
Additionally, an event similar to the following is recorded in the application
event log:

  Event ID: 13003
  Event Type: MSExchangePOP3
  Event Source:
  Event Category: Authentication
  Description:

  Hr lookup credentials () call failed with error logon failure. Unknown user
  name or bad password.

CAUSE
=====

This behavior may occur if the Exchange Server mailbox alias is different from
the Microsoft Windows user account name.

RESOLUTION
==========

To resolve this issue, use one of the following methods, as appropriate to your
situation:

- Use the following format for the user account name on the client, where
  <Domain> is the name of the domain, <UserName> is the Windows
  user account name, and <Mailbox> is the Exchange Server mailbox alias:

  <Domain\UserName\Mailbox>

-or-

- Change the Exchange Server mailbox alias to use the same name as the Windows
  user account name. By doing so, users require only one account name.

NOTE: The <Domain\UserName\Mailbox> format is used by and works with
Microsoft Outlook Express clients. Results may vary with other clients.

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

For additional information about how to troubleshoot a similar issue, click the
article numbers below to view the articles in the Microsoft Knowledge Base:

  Q236032 OLEXP: Outlook Express and Outlook Repeatedly Prompt You for Your
  Password

  Q199274 XCON: Event 13005 During POP3 Logon

Additional query words: front page

======================================================================
Keywords          : kberrmsg 
Technology        : kbExchangeSearch kbExchange550 kbZNotKeyword2
Version           : :5.5
Issue type        : kbprb

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