Me and my girlfriend are trying to play D2 together but every time we try to connect through TCP/IP it says "Cannot connect to server." I attempt the whole pinging situation as suggested by Blizzard's support page, and lo and behold I have issues pinging her and any other site or network,etc, saying "Request timed out". I've made exceptions in my Windows Firewall, turned off any and all firewall-type programs and still nothing, and Blizzard says nothing about how to fix this kind of issue, just tells you how to figure out if you have an issue.
Me and my gal realllly want to play. What can I do to fix this?