What Port Does "TF2" Use?

By John Grossman

Updated September 22, 2017

When playing Team Fortress 2, or TF2, it is important that your computer can access every required port to ensure connectivity. Team Fortress 2 is an online video game from Valve Corporation that requires players to maintain an Internet connection during play. By opening the required ports in your firewall, you can allow Team Fortress 2 to be both receive and send gameplay data.

When receiving and sending information on a network, all data goes through ports, which are software identifiers for network data. Every port has a specific number that identifies it. For example, when downloading a webpage, all the data your computer receives from the server uses port 80. Firewalls block certain ports on your computer to protect it against intrusions. If you are playing a video game or using a program that normally uses a port your firewall blocks, that application will not be able to send or receive data to and from the Internet.

Team Fortress 2

Team Fortress 2 is an online first-person shooter in which two teams of up to 16 players fight against each other on a series of maps. As in all other online first-person shooters, it is essential to maintain optimal Internet connectivity while playing Team Fortress 2 to ensure a smooth gameplay. To play Team Fortress 2 on PC or on Mac, players need to first install Steam, the gaming platform from Valve.


Steam is a gaming platform that allows players to buy, try and play hundreds of Mac and PC video games. To play games on Steam, players need to ensure that a series of ports are open in their firewall. If your firewall blocks some of these ports, you might either be unable to play the game or launch Steam, or you might not be able to access certain features such as voice chat.


Steam requires you to open User Datagram Protocol (UDP) ports 27000 to 27015 and 4380 in your firewall to launch games. You can get access to additional features while playing by opening UDP ports 3478, 4379 and 4380. To open ports, launch your firewall application if you are using a software firewall and edit its settings. If you are using a router or a modem with a built-in router, refer to its documentation and follow the procedure to open ports.