XADM: POP3 Secure Password Authentication (191558)
The information in this article applies to:
- Microsoft Exchange Server 4.0
- Microsoft Exchange Server 5.0
- Microsoft Exchange Server 5.5
This article was previously published under Q191558 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.
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.
WORKAROUND
Change the users mailbox alias to match the Windows NT account in the
Exchange Server Administrator program.
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."
| Modification Type: | Minor | Last Reviewed: | 4/28/2005 |
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| Keywords: | KB191558 |
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