IIS 10.0 Detailed Error – 404.11 July 28, 2020 ICO HTTP Error 404.11 – Not Found The request filtering module is configured to deny a request that contains a double escape sequence. Most likely causes: The request contained a double escape sequence and request filtering is configured on the Web server to deny double escape sequences. Things you can try: Verify the configuration/system.webServer/security/requestFiltering@allowDoubleEscaping setting in the applicationhost.config or web.confg file. Detailed Error Information: Module RequestFilteringModule Notification BeginRequest Handler StaticFile Error Code 0x00000000 Requested URL http://www.aberystwyth-today.co.uk:80/article.cfm?id=133528&headline=Aberystwyth%20University%20to%20investigate%20data%20breach§ionIs=news&searchyear=2020 Physical Path E:Domainsaberystwyth-today.co.ukwwwrootarticle.cfm?id=133528&headline=Aberystwyth%20University%20to%20investigate%20data%20breach§ionIs=news&searchyear=2020 Logon Method Not yet determined Logon User Not yet determined More Information: This is a security feature. Do not change this feature unless the scope of the change is fully understood. You should take a network trace before changing this value to confirm that the request is not malicious. If double escape sequences are allowed by the server, modify the configuration/system.webServer/security/requestFiltering@allowDoubleEscaping setting. This could be caused by a malformed URL sent to the server by a malicious user. View more information » Source link Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related Leave a comment Cancel reply Notify me of follow-up comments by email. Notify me of new posts by email.