I have installed PRTG on a Windows 2008 R2 SP1 web edition machine with IIS 7.
In PRTG's Web Server setup (in PRTG Server Administrator), I try to select HTTP (Port 443) and from the Specify IPs list, I select an IP address that is not used by any of my websites. However, I still get the following error message when trying to save my settings:
None of the selected IPs could open port 443 which PRTG needs for SSL. Please specify at least one IP with port 443 open or deactivate the SSL option.
netstat -a on Windows command line, entries with port :443 appear in the list.