Microsoft KB Archive/298944

= XADM: Error Message Cites Logon Problem and Password Rejection When You Try to Connect Through POP3 Client =

Article ID: 298944

Article Last Modified on 10/28/2006

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APPLIES TO


 * Microsoft Exchange Server 5.5 Standard Edition

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This article was previously published under Q298944



Important This article contains information that shows you how to help lower security settings or how to turn off security features on a computer. You can make these changes to work around a specific problem. Before you make these changes, we recommend that you evaluate the risks that are associated with implementing this workaround in your particular environment. If you implement this workaround, take any appropriate additional steps to help protect your system.

Warning This workaround may make your computer or your network more vulnerable to attack by malicious users or by malicious software such as viruses. We do not recommend this workaround but are providing this information so that you can implement this workaround at your own discretion. Use this workaround at your own risk.

Note An antivirus program is designed to help protect your computer from viruses. You must not download or open files from sources that you do not trust, visit Web sites that you do not trust, or open e-mail attachments when your antivirus program is disabled.

For additional information about computer viruses, click the following article number to view the article in the Microsoft Knowledge Base:

129972Computer viruses: description, prevention, and recovery



SYMPTOMS
When you attempt to connect to Exchange Server by using Outlook Express or another Post Office Protocol (POP3) client, you may receive the following error message:

There was a problem logging onto your mail server. Your Password was rejected. Account: ' on  ', Server: ' ', Protocol: POP3, Server Response: '-ERR Logon failure: unknown user name or bad password.', Port 110, Secure(SSL): No, Server Error: 0x800CCC90, Error Number: 0x800CCC92

Also, Event Viewer may report the following events:

Event Type: Error

Event Source: MSExchange Pop3 Interface

Event Category: Configuration

Event ID: 11508

Description:

Accept clients on POP3 interface failed in function HrRegisterProtocol with error 0x2740.

Event Type: Error

Event Source: MSExchangeIS

Event Category: General

Event ID: 1194

Description:

Accept clients on external interface POP3 failed with error 0x80004005.



CAUSE
This issue can be caused by third-party antivirus software services that are currently active.



RESOLUTION
To resolve this issue, stop or turn off all antivirus services that are currently active on the system.



MORE INFORMATION
In some cases, simply turning off the antivirus software does not resolve this issue. You may need to completely remove the antivirus software, restart the computer, and then reinstall the antivirus software.

The antivirus program may be taking ownership of the POP3 port so that when Exchange Server attempts to gain access to the port, the port is already in use by the antivirus program. Some antivirus programs have an option that you can deselect to keep the antivirus program from taking control of the POP3 port, so that POP3 mail can be downloaded.

The computer may also display a Dr. Watson error message in PoProxy.exe when Exchange Server starts. This issue can occur if Norton AntiVirus is installed on the computer and the Norton e-mail protection program process, PoProxy.exe, is running. PoProxy.exe is a client component. If PoProxy.exe is installed on an Exchange Server computer, you must completely remove it. Simply disabling PoProxy.exe does not resolve the issue.

For more information about PoProxy.exe, see the following article in the Microsoft Knowledge Base:

292522 XCCC: Port 110 Is Not Responding on Exchange 2000 Server

For more information about Event ID 11508 and error 0x2740, see the following article in the Microsoft Knowledge Base:

271275 XADM: Event IDs 11506 or 11508 with error 0x2740 Are Logged

For more information about Event ID 11508 and antivirus software, see the following article in the Microsoft Knowledge Base:

250926 XFOR: GroupShield Interferes with POP3/IMAP with SSL Enabled

Keywords: kberrmsg kbprb KB298944

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