IP Search failure

FS9 Multiplayer does not find or identify IP addresses. It worked fine for several months, but then last week it would not identify IP's during a search, even though I knew the site was active and functioning properly. This problem exists even with all firewalls and security programs totally deactivated! The ports (both client and host) are set at the default (23456). I have reinstalled both FS9 and DirectX 9.0 with no improvement. I can multiplay on Links 2003, and TeamSpeak works properly.Can anyone give me any ideas at all as to how to solve this?Steve Baker