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Which ports are required to play Civilization 4 online?

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Ports required to be opened / forwarded are below:

Ports to be opened TCP and UDP (incoming and outgoing)

2033
2056

Further to this the following ports are required if playing through the Gamespy server:

6667 (IRC)
3783 (Voice Chat Port)
27900 (Master Server UDP Heartbeat)
28900 (Master Server List Request)
29900 (GP Connection Manager)
29901 (GP Search Manager)
13139 (Custom UDP Pings)
6515  (Dplay UDP)
6500  (Query Port)

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