The first thought that comes to me about this is firewall. Does your brother run a firewall on his system? If so, he may have to make some changes to let you connect to him.
His IP may also be running some sort of firewall protection. I had this problem when trying to connect with a friend on AOL to play Diablo 2. He set up as host and I just could not connect to him. However, he could connect to me with no trouble at all.
So I suggest looking into the firewall matter first. Good luck.
Nightowl2
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