Fix-It Utilities Make your PC run like new! Includes Anti-Virus, Anti-Spyware, hardware diagnostics, registry fixer, and more!
RadarSync Ensures you have the latest drivers and software updates to make your PC run better and safer.
Partition Commander Now it's easy for anyone to safely partition their hard drive! You can reclaim waste disk space, organize files, even add new OSes.
Authorization failed by ISAPI/CGI application
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 or a CGI type application (another langauge). This extra code has rejected the login, likley due to the server having the wrong file or directory permissions.
401.5 - Unauthorized: Authorization failed by an ISAPI/CGI application.
The URL you attempted to reach has an ISAPI or CGI application installed that verifies user credentials before proceeding. This application cannot verify your credentials.
Error messages will differ depending on the web server and if replaced by the web site designers.
Frequency is relative to other Internet warnings and errors.
Solutions and Fixes
This issue can only be fixed by the web site owner.
You might notify the webmaster about the issue. Include the error number and the address (URL) where the error occurred along with any other relevant details.
Many sites use an email address in the form email@example.com where you replace sitename.com with the web sites address (don't include a www). Keep in mind with the amount of spam, they may use a different address and/or it might get ignored. Check the websites' contact information to get reliable contact information.
FaultWire Staff Posted: 8-Oct-2008
Authorization failed by ISAPI/CGI application. An ISAPI application or a Common Gateway Interface (CGI) application does not let the request be processed because of an authorization problem.
"401.5 Authorization failed by ISAPI/CGI application" 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.
While we believe this information up to date and accurate, FAQware is not responsible for any inaccuracies. If you find something that is out of date or inaccurate, please let us know at
so we can correct it.