Connection Sharing

Did a quick search on the forum but couldn't find anything. Anyway heres the problem:

I have 2 computers currently sharing my internet connection. Each have Tribes Vengeance installed with a different Product Key from each other.
Now then, they can both go online at the same time on seperate servers. However when it comes to joining the same server, it tells me the Product Key is already in use. This is not possible as both have their own unique code.

Is it because i'm sharing the same IP Address? Is there any way of getting around it?

Thanks in advance - Y2Rimmer

I have the same set up and purchased 3 seperate games for my 3 computers. Attempt joining your server through lan. I've never had this problem you described other than when I attempted doing the same back during the beta when both computers did have the same serial#.

Thanks for the reply. The other computer can connect fine if i'm hosting a server. However the problem only occurs when joining someone elses server over the net.
I will try again in a bit and see if the problem is still lingering.