According to these two pages, that is a modem only, not a modem/router like some modems are. (
http://forums.softhardware.net/ar/t2591.htm and
http://forums.softhardware.net/index.php?showtopic=2591 ) therefore the ports should just be open.
There is a manual for your modem on this page:
http://www.timewarnercable.com/Custo...20&MarketID=68 and it doesn't mention anything about being able to configure it through a browser nor does it mention port forwarding.
You are positive that the firewall is turned off? (Sys Prefs > Sharing > Firewall )
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