My roommate and I live in our university housing and we are unable to connect to each other's parties. We are able to play multiplayer separately, but are unable to join each other's fireteams.
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This should be edited to #Help there are multiple reports and replies from Bungie on this issue
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Talk to your campus network police - might need to beg for port(s) to be unfiltered / opened / unrestricted or use VPN.... Exhaustive overview in document found [url=http://pcgamingtips.blogspot.com/2010/03/post-your-pc-gaming-troubleshooting.htmlt]here[/url]