Getting Tomcat 8.5 to work with Netbeans 16 on Windows is maddeningly difficult in large part because the windows service installer for Tomcat doesn’t set the defaults that Netbeans needs.

If you’re on this page, it’s because you’ve been frustrated with it too. The magic formula to install tomcat correctly seems to be:
1. Set the server shutdown port to the default expected by Netbeans (8005) not the default (-1)
2. Add a Tomcat Administrator (e.g. user name=Tomcat password=Tomcat
3. Add manager-script to the Roles