Network Socket Could Not Be Created...?

I'm trying to link my computer with my brothers to play Civilization 4 mulitplayer. My brother is running vista. When I try to create a new multiplayer game on his computer, it gives me an error that 'network socket could not be created.' We have a switch that both of us are plugged into. ... show more I'm trying to link my computer with my brothers to play Civilization 4 mulitplayer.

My brother is running vista. When I try to create a new multiplayer game on his computer, it gives me an error that 'network socket could not be created.'

We have a switch that both of us are plugged into. I've looked at the firewall and tried to enable everything I thought would be necessary. I've created a workgroup on his computer and one of the same name on my computer.

What do I need to do to get this working?

thanks
Update: The ping did not respond, all packages were lost.

My computer is a mac on OSX.
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