UPDATE: Please note that the original Activision Master server is back again, you don't need to edit or Install anything for now except the official patch 1.1(windows).
The Elite Force II community moved to a new Master server provided by a member of the community it self.
There won't be a official patch, how ever once again the community provides it self with a in-official patch. This patch edits your windows hosts file to reroute the game to the new master server.
If you are running Windows you can download and use a tool to do all the changes for you.
For everyone else you can find the instructions to manually made the changes in our forums
You will also need the Official Patch 1.1 to play on-line (Windows only).