Article ID: 198444 - View products that this article applies to.
This article was previously published under Q198444
When you try to log on to a Microsoft Outlook Web Access (OWA) client, you may receive one of the following error messages:
Error message 1
HTTP Error 401
401.1 Unauthorized: Logon Failed
Error message 2
Failed to get Inbox.
Error message 3
OWA was unable to get to your Inbox.
The alias or user name that is specified may not be unique in the Microsoft Exchange Global Address List. Ambiguous names include any Last Name, First Last, or Alias that is entered in the logon screen that is equal to any Last Name, First Last, or Alias for any other mailbox. For example, John Doe's alias is jdoe, and Joseph Doenfron's alias is doe. If Joseph enters his alias in the logon screen, he will receive one of the error messages that is mentioned in the "Symptoms" section because of the ambiguity of his alias with John's last name as the server tries to resolve them.
This may occur if you join one or more sites that contain multiple users with the same alias or with the same display name. If an ambiguous (non-unique) name is detected, Microsoft Exchange Server cannot resolve the name to a specific mailbox, and error messages are returned.
When you create a domain account, try to avoid using names with similar prefixes and repeating suffixes. Try to create unique Windows NT domain logon names and unique Exchange Server mailbox alias names.
In Microsoft Exchange Server version 5.5 and later, you can enter the following fields for the user's mailbox:
For additional information about what to do if you receive an error message when you use your SMTP address, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/248081/ )XWEB: Suddenly and permanently unable to reach Inbox using Outlook Web Access
You can also use another method to work around this issue and to log on to OWA 5.5. You can use this method if the aforementioned workaround is not acceptable, or if you want to bypass the Logon.asp page.
After you specify your mailbox name and provide your credentials, Cdo.dll and Cdohtml.dll create dynamic URLs that the browser client uses to access Exchange information. These URLs are created only while a browser session is open with OWA and are cleared after you close the browser session.
You can create a browser shortcut that contains the URL to a specific user's mailbox to effectively bypass the Logon.asp page and to go directly to the user's Inbox. For the URL to function correctly, make sure that the name that you use to log on to OWA works correctly. If you are using this method because of ambiguous name resolution issues, this is very important.
To create a browser shortcut that contains the URL to a specific user's mailbox to bypass the Logon.asp page and to go directly to the user's Inbox:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
Article ID: 198444 - Last Review: October 28, 2006 - Revision: 5.3