I use Bootcamp to dual boot my iMac. The launcher never connects to the news server running under MacOS but when I reboot the system using Windows 7 it almost always connects. This is the same hardware at the same NAT address through the same hardware firewall. This is a BUG in the MacOS WoW launcher.
Firewall WNDR3400 latest firmware
Ports open and linked to system as per firewall configuration recommendations
System set to a reserved NAT DHCP address via MAC, 192.168.202.101 in this case.
Model Name: iMac
Model Identifier: iMac7,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.4 GHz
Number of Processors: 1
Total Number of Cores: 2
L2 Cache: 4 MB
Memory: 4 GB
Bus Speed: 800 MHz
Boot ROM Version: IM71.007A.B03
SMC Version (system): 1.20f4