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401.4
Authorization failed by filter
Description
The web server has denied the login request. The web server allows extensions to be added to the server that are written by other developers. This extension/filter processes the login and has rejected it.
Example
Server Error
401.4 - Unauthorized: Authorization failed by filter installed on the Web server.
You might not have permission to view this directory or page using the credentials that you supplied. The Web server has a filter installed to verify users connecting to the server and it failed to authenticate your credentials.
Error messages will differ depending on the web server and if replaced by the web site designers.
Occurrences
Frequency is relative to other Internet warnings and errors.
Solutions and Fixes
Solution 1 of 1 - Use Correct Information
43
Enter a correct username and password. Remember that most passwords are case-senstive.
Official Explanation
Authorization failed by filter. An ISAPI filter does not let the request be processed because of an authorization problem.
"401.4 Authorization failed by filter" is only supported by Microsoft IIS (Internet Information Services) web servers.
ISAPI = Internet Server Application Program Interface
The four hundred series of errors indicate something was sent to the remote web server incorrectly.
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