Support port forwarding?

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http://androidforums.com – so i have the lg esteem on metro pcs and ive rooted it. i aso use wifi tether to play games on my laptop using my 4g, but i cant pay diablo 2 because i get a error saying port 6112 is closed. ive tried the port forwarding app but it doesnt work. ive also ran a port scanner i found that says port 53 on my phone is the only port open. any assistance in solving my problem would be appreciated. (General)