[14:46] <@Thyth> You could manually enter your IP address.
[14:47] <@Thyth> $IPv4::InetAddress = "xx.xx.xx.xx";
[14:47] <@Thyth> Fill in the numbers so that they match what you get from http://www.whatismyip.com/
As for Boonie Dog's suggestion - hmm - that is a good question as to when you would type it in. I know that it is usually typed in from the console on the first screen following the log-on screen (i.e. Player Name, Password screen) and then the next screen which is usually the server screen which is where you are crashing :/
Have you pm'ed Thyth? If so - another place you might find the answer is the TribesNext Forums (http://www.tribesnext.com/forum/index.php?board=2.0)