At least is there a way to understand whether we opened the port or not?

I mean when I try to connect my brothers' game at first for a second it looks like it downloads the map but then the transfer speed decreases to 0 and stays there.

And this is the log file of my brother. He cannot host a game. We think that He opened the port

Hi,
we bought this game just to play together.
We opened the ports using PortMapper as explained.
And we closed the firewalls of both our routers and windows.
Now when we try to connect open games, we can connect.
And when I host a game, my brother can connect.
But when he host a game I cannot ...