Is there another port Diablo 1 can use for battlenet

As the title says. Is there another port I can forward for connection to battlenet in Diablo 1? wife and I bought the game for playing together on battlenet. got everything set up. but then i hit the issue with connecting. although a port range is given it all hinges on port 6112. i tried splitting the range between the computer but the only one that connect is whichever one gets the 6112 assignment. so i’m hoping there is some kind of other work around. i tried selecting the lan and direct connection since it was listed but they weren’t working at all. it always returned not configured or no games found. if it’s not possible for my wife to play together does blizzard have a return policy? we just bought the games today so we haven’t had long yet and beside the few hours trying to figure this out have not actually played the game.