A client of mine is using a Windows Server with Plesk 18 Obsidian. He installed CF 2021, but he can't get CF to connect to IIS. When running the web server configuration this error message is shown: "Error while configuring connector for IIS. Make sure you have administrator privileges" and any requests to a .cfm page result in a 404 When manually configuring the connector, IIS complains that the web.config file contains invalid XML. FRom what I found out that means it cannot access the DLL for the connector. So there seems to be some permission related problem, maybe due to Plesk interfering with IIS. Being neither a Windows or a Plesk guy, I am at loss as which accounts to check or how to proceed. Does anybody have experience with installing ACF on a Win/Plesk server?

Disable UAC, remove Plesk, and restart. Re-install Plesk. Configure plesk, check and test everything. If working then re-enable UAC and restart. Check again.

Thank you for your help. Unfortunately that didn't solve the problem so far. They are now checking if they can get along without Plesk.