heres info from my side of NAT
29/08/2007 02:25:55 192.168.1.2 4754 XXXXXXX-x.xxxxxx.xx.home.nl [xx.xx.xx.xxx] 63392 Outgoing Allowed X:\Games\LFS-V\LFS.exe
Ping statistics for XX.XX.XX.XXX:
Packets: Sent = 4, Received = 3, Lost = 1 (25% los
Approximate round trip times in milli-seconds:
Minimum = 63ms, Maximum = 2964ms, Average = 1030ms
Seem you have packet loss and firewall is blocking (or bad router port config).