I/O Exception: peer not authenticated usually means you are having a SSL certificate failure. This can be that the url domain name does not match the certificate or the certificate root and/or intermediaries are not in your local certificate store. So far I have not found a way to tell CF to ignore certificate issues and just connect using it so writing an app to scan random or dynamic UR's will be very difficult as it will mean a lot of manual certificate importing. You can google "coldfusion SSL import certificate" of "coldfusion SSL problems cfhttp" and find several threads and posts on this topic.
