I would not use IIS on Windows 11 to do dev on CF, unless you really need windows specific code, and even then, better off running your dev on an actual server. That being said, as ADMINISTRATOR, install IIS, once IIS is installed, Go to settings, go to privacy and security, Disable real-time protection, add an exclusion folder, folders to add, IIS, Your C:\CF2021 & WhateverWebRootYouAreGoinGToUSE. Go to Control Panel, Disable your Windows Firewall, Go to your coldfusionXXX binary, right-click on it, and CHOOSE INSTALL AS ADMINISTRATOR, choose the path c:\cf2021 Follow prompts blindly and click YES. once done go back to IIS, restart the service. You should now have a appPool Connector for CF2021. Finally, Add your WebDev site and make it match the Exclusion Folder you added above. Now Go to Windows Firewall, Add all ports needed for your CFInstall both inbound and outbound, by port and by program executable. OR create a Microsoft LoopBack Adapter, Assign It an private ip address of 127.0.0.10 or what not, Then create a rule to allow all traffic from the loopback adapter to all inbound and outbound traffic. Then assign your CFIISDev to the bound 127.0.0.10. Finally and this is the most important part, send me 7.99 for a beer, as beer..