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When I make a game on halo PC my buddies get the retrying server. Now I have opened all the ports.
Are you absolutely sure your firewall isn't blocking it? I'd check that one first.
Yeah my guess would be test your firewall!!!
AMD Phenom 9500 (2.2GHz) Quad-Core4 GB PC2 6400 Ram(Temp) XFX GeForce 8400GS (512MB)32" LCD HDTV running at 1366x768HITACHI 160GB & Western Digital 500GB SATA II HDD
you may have to setup port forwarding on your router if you have one and if you haven't already.
Same thing happens with me :\ which ports have to be opened? I tried 2302 and 2303, the 2 default ones :/
It just happens sometimes. I don't know Jack about networking, but I'm guessing that's just the way it rolls sometimes.