Microsoft KB Archive/204175

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XWEB: HTTP Error 401 401.1 Unauthorized Logon Failed

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Q204175

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The information in this article applies to:


 * Microsoft Outlook Web Access, version 5.5
 * Microsoft Exchange Server, version 5.5

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SYMPTOMS
When you are using Outlook Web Access (OWA), you may receive the following error message:

HTTP Error 401 401.1 Unauthorized: Logon Failed

The following event may be to the application log of the Microsoft Internet Information Server computer:

Event ID 100

Details

Source: w3svc

Category: none

Type: Warning

Description The server was unable to log the windows NT account "USERNAME" due to the following error: Log on failure: Unknown user name or bad password. The data is the error code.

CAUSE
These errors may occur if you type account credentials incorrectly three times into the Logon dialog box.

RESOLUTION
When you type user credentials, ensure that you are using the following syntax:

"domain name\user name" If you do not specify the domain name, the account may not be properly validated.

MORE INFORMATION
For additional information, click the article number below to view the article in the Microsoft Knowledge Base:

"Q247593 Error Message: 401.1 Error (Unauthorized: Logon Failed)" Additional query words:

Keywords :

Issue type : kbprb

Technology : kbOutlookSearch kbExchangeSearch kbExchange550 kbZNotKeyword2 kbOWASearch kbOWA550