Start up ArmA 3, head the multiplayer server browser and click "remote".
Paste this connection info in:
IP - 31.3.225.42
PORT - 2300
It should quickly refresh and show a green dot next to the server name. Double click the server name to join.
If there isn't a a green dot and you've got a red X, join anyway and make a note of the error message and post it here.
If you've got ArmA 3 Epoch or Breaking Point installed, you might have to disable them. I found the easiest way to do this is to simply rename the folders from "@Epoch" to "Epoch" and "@BreakingPoint" to "BreakingPoint".
Easy enough to restore. Just re-add the @.
As always, report any bugs and problems you find to us and we'll see what we can do.
Expect the occasional restart and we alter configs and smooth things out.
I'll add more info here as/when needed.
HELP KEEP THE SERVERS RUNNING WITH A SMALL DONATION
PLEASE STATE WITH YOUR DONATION YOUR INGAME NAME AND WHAT SERVICE YOU ARE DONATING TO