Microsoft KB Archive/198704

= You receive error 0x800ccc90 or error 0x800ccc18 when you try to log on to Exchange Server by using Secure Password Authentication =

Article ID: 198704

Article Last Modified on 10/28/2006

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APPLIES TO


 * Microsoft Exchange Server 5.0 Standard Edition
 * Microsoft Exchange Server 5.5 Standard Edition

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This article was previously published under Q198704



SYMPTOMS
When you try to log on to Microsoft Exchange Server with Outlook Express by using Secure Password Authentication, you may see the following error messages in Microsoft Outlook Express. Look in the Details of the Error tab after failing to connect.


 * Unable to logon to the server using Distributed Password Authentication.

Account:'Company POP3 Server Accnt.',

Server: 'server.company.com',

Protocol: POP3,

Server Response: '-ERR The AUTH protocol exchange was canceled by the client.',Port: 110, Secure(SSL): NO, Server Error: 0x800ccc90, Error Number: 0x800ccc18

On the Exchange Server computer you will see the following Event IDs:

Application event log error:

13005 MSExchange Pop3 Authentication

Logon attempt by NTDomian\User from 157.57.148.24 to NtDomain/User has failed: EcGetMailboxDN call failed with error The requested mailbox is not available on this server.

11310 MSExchange Pop3 Authentication

The following error occurred: The requested mailbox is not available on this server.



CAUSE
Either the Outlook Express POP3 client is not able to access the mailbox because it does not exist or there is a custom recipient in the Exchange Server organization that has the same alias as you do, and Exchange Server is attempting to access the custom recipient before accessing your mailbox.



WORKAROUND
In Outlook Express, try using Clear Text, which is the Log on using option under the Servers tab of the mail account.

To do so:
 * 1) On the Tools menu, click Accounts. This will bring up several tabs.
 * 2) If you select any listed mail account, the properties will have a Servers tab with the Log on using option.
 * 3) Select the Clear Text option.

If this works, then you were trying to access a non-existent mailbox or the wrong mailbox. If this does not work, then the administrator needs to check for and remove the custom recipient.



MORE INFORMATION
When a user tries to log on to Exchange Server with Outlook Express and Secure Password Authentication, the client will pass the credentials of the user logged on to the workstation. If the logon works using the Clear Text option: , the user will have to change his or her mailbox alias to the Windows NT account name in order to use Secure Password Authentication. This is because Secure Password Authentication will not pass the mailbox alias information. It defaults to  and Exchange Server assumes the alias to be the Windows NT account.

Keywords: kberrmsg kbfaq kbprb KB198704

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