Solved! Go to Solution.
Print from URL uses the HTTP & HTTPS protocols only. FTP uses the FTP protocol.
If you want to use the same server you will need to go to IIS and create a virtual directory (right click on IIS Manager>Sites>Default Web Site) for the directory you're aiming for. You'll also need to enable Directory Browsing for that directory in your IIS settings. You can use Google for more information about setting this up I believe.
I would also remove the FTP part unless you were already using it.