So, this is the first time I have ever encountered an issue with NAT.
When attempting to play Test Drive 2 Unlimited my NAT goes, seemingly randomly, through Open, Moderate, and Strict.
This makes playing with friends near impossible, we can't see each other.
I have tried:
- Enabling UPnP
- Manually opening ports 8889 and 3478.
- Disabling my firewall.
- Ending other applications using the connection.
- Set NAT Filtering to Open.
My wife and I are on the same wired network and have managed to sync up with each other a couple of time after dozens of attempts.
I have the same issue trying to play with a friend who is on another network.