Thursday, October 30, 2008

Hi, I am going to discuss resolution for the You receive error (Client response invalid error) 0x800cc90 or 0x800ccc18 when you try ro log on to MIcrosoft Excchange Server with Outlook Express by using Password Authenticationan.

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: '',
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 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.


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.


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.


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