Hi Guardfather.
The newest version to T2 is version 25034. You can tell if you have the correct version by going to your game tab in T2 and the version number will be in the top right hand corner of your game tab (screen that your character is shown on) If you have the correct version it will say 25034.
If you do not have version 25034 you can download it here.....
http://www.rawr32.net/downloads/t2scrip ... _25034.exe
You can also find Defense Turret there as well.
Now after you get the updated version installed then all you have to do is download and install Defense Turret.
After all that you must open Tribes 2 using the icon provided by the Defense Turret Instalation. The Tribes 2 Online shortcut will not work unless you change the target location and Im not sure how to do that. The autoupdater doesnt work anymore. Besides, if your going to play T2 you need defense turret on anyway so why not just use the provided icon eh?
After that you should be good to go and should have no probs finding servers.
My guess is your not on the current version, thats why your not finding any servers.
Hope that helps.