XADM: POP3 Secure Password Authentication

Retired KB Content Disclaimer

View products that this article applies to.

This article was previously published under Q191558

Expand all | Collapse all

SYMPTOMS

Mail can not be downloaded or viewed using Microsoft Outlook Express Secure Password Authentication (SPA) to access messages on an Exchange Server computer. You may receive the following error message:

You could not be logged on to the mail server using Secure Password
Authentication. Please check your account information and verify that
your mail server supports Secure Password Authentication.

This functionality requires that Exchange Server has the Windows NT Challenge/Response enabled for the POP3 protocol.

Back to the top

CAUSE

This problem may occur when a client using SPA tries to log on to a mailbox where the mailbox alias is different than the Windows NT account. The mail client uses the computer's logon credential information for SPA and assumes that the mailbox alias will be the same as the Windows NT account.

Back to the top

WORKAROUND

Change the users mailbox alias to match the Windows NT account in the Exchange Server Administrator program.

Back to the top

MORE INFORMATION

You can test this by telneting to port 110 of the server. After you receive the server's "ready" response from the Exchange Server computer, type "Auth NTLM," (without the quotation marks) and CRLF. If you get "+ OK," then the server supports Secure Password Authentication. Otherwise, you will receive "The NTLM Authentication package has been disabled for this protocol."

Back to the top

APPLIES TO

Microsoft Exchange Server 4.0 Standard Edition
Microsoft Exchange Server 5.0 Standard Edition
Microsoft Exchange Server 5.5 Standard Edition

Back to the top

KB191558

Back to the top

Retired KB Content Disclaimer

This article was written about products for which Microsoft no longer offers support. Therefore, this article is offered "as is" and will no longer be updated.

Back to the top