You may not have the Bastion of Thunder zone files, and if you do, you may not have enough dynamics on your server to open up another zone port.
Code:
SELECT * FROM launcher;
If your dynamic zones are at 5 and you have 5 zones open already, you cannot open a new zone, you'll need to make it higher. I have mine at 50; however, that may be too much in your circumstance. I hope you get this all worked out.