Joining other servers as a client should work pretty easely if your internet connection settings are working as it has to be. Creating a new server could give some trouble if you are under a router, if you are, then you have to open the router ports that are used for JJ2. And about my JJ2 activeness, I'm 16 years old and I'm playing the game since 1998, and I've joined the community early in 2003.