Collectible Card Game Headquarters

I'm a little lost on the Online Multiplayer for MTG Forge.

Me and my brother are not able to play each other.
Me and my brother are on the same I.P. thus are on the same router. Would that be a problem whilst trying to play each other? We can get to the pre-game lobby, however as soon as i press the start icon to began a message pops up saying you have lost connection to the host!

Any help or recommendations would be greatly appreciated!
and thank you very much!

It's buggy. But I've been successful in connecting. Use the local IP addresses in the prompt.

I've been testing it for a while now, i've tried different routers different I.P.'s other computers! i have the latest Update to java. Running the latest beta of Forge.
I cant seem to connect for anything.

I have many times tried to use the local IP addresses in the prompt lol.

I'm at a loss

The Error code below may be of some help to anyone working on the online functionality.

Bump - I have exactly the same problem on the latest snapshot https://snapshots.cardforge.org/

Please please fix this I would love to try a multiplayer game!