Here is a list of the ports that need to be forwarded for Half-Life: Opposing Force Server:
Half-Life: Opposing Force Server - PC
- TCP: 27015
- UDP: 27015
Setting Up a Port Forward for Half-Life: Opposing Force Server

When you use Half-Life: Opposing Force Server you might need to forward some ports in your router. By forwarding ports you allow connection requests coming from the internet to be directed to Half-Life: Opposing Force Server.
Routers generally do not allow incoming connection requests from the internet. By forwarding a port you can overcome this limitation.
Before You Forward a Port
Make sure that you know these things before forwarding a port:
- Your router's IP address.
- The IP address of your computer.
- The TCP and UDP ports that need to be forwarded.
Find Your Router's IP Address
We have free Router Detector software to help you find your router's IP address. Our Router Detector tool is free to use and is part of our Network Utilities software.
We have a guide you can follow Find Your Router IP Address if you don't want to run the software.
How To Set Up Port Forwarding for Half-Life: Opposing Force Server
A smart way to forward your ports is to use Network Utilities. Our Network Utilities software allows you to add port forwards and also remove them when you no longer need them to maximize your network security.
Alternatively you can do it by hand. The way to forward a port is:
- Start by logging in to your router.
- Locate your routers port forwarding section.
- Type the IP address of your computer into the correct box in your router.
- Enter the TCP and UDP ports that you need to forward for Half-Life: Opposing Force Server in the corresponding boxes in your router.
Some routers need to be rebooted in order for the changes to be saved.
You can choose your router from our list to see exactly how to forward ports for Half-Life: Opposing Force Server:
List of Routers - Customized for Half-Life: Opposing Force Server
That's all it takes to forward your ports for Half-Life: Opposing Force Server.