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- doomsday
- ]. Doomsday uses TCP network connections for multiplayer games. If you host a game and are behind a firewall or using NAT, you must make sure that other c... pening the appropriate incoming TCP ports on your firewall and/or configuring the NAT so that the correc... with autodetecting local servers, check that your firewall isn't blocking these UDP ports on either end.... port must be open for incoming TCP traffic in the firewall. The port number is configured with the conso