I don’t see checkip server working with port 8245…
/usr/bin/nmap -T Normal checkip.dyndns.org
Starting Nmap 5.00 ( http://nmap.org ) at 2010-08-18 04:11 EEST
Warning: Hostname checkip.dyndns.org resolves to 3 IPs. Using 208.78.69.70.
Interesting ports on checkip-pao.dyndns.com (208.78.69.70):
Not shown: 998 filtered ports
PORT STATE SERVICE
80/tcp open http
443/tcp closed https
Nmap done: 1 IP address (1 host up) scanned in 13.39 seconds