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Guide
Here are the ports you must open on your network/router in order to ensure the best multiplayer online experience with Lost Planet PC.

Lost Planet UDP 3075 send/receive
Lost Planet UDP 27215 send/receive
Lost Planet TCP 27030 to 27050 send/receive
Lost Planet UDP 27000 to 27015 send
Lost Planet UDP 27216 send

Steam Client UDP 1200 (For the Friends service)
Steam Client UDP 27000 to 27015
Steam Client TCP 27020 to 27050

Steam Dedicated Server UDP 27015 (Default HLDS, SRCDS and HLTV ports)
Steam Dedicated Server UDP 27020 (Default HLDS, SRCDS and HLTV ports)
Steam Dedicated Server TCP 27015 (SRCDS Rcon port)

Steam UDP 26900
Steam UDP 27015
Steam UDP 27017

Note: To host a match, you must have an open static IP or enable "port forwarding" on your router in order to create a match.

Note 2: Windows XP SP1 firewall users running Source Dedicated Server must open TCP Port 27015 for Rcon to work.