Initially, you’ll require getting to the Port Forwarding section of your router. The methods of port forwarding vary from router to router (it totally depends on brand that you are using). However, you can simply figure out the IP to access your router by starting a command prompt and typing ipconfig into the command line. In the information that comes up, you will get default Gateway IP. Enter that into your preferred web browser, and after doing that you should get to your router's setup page. I am using the Linksys router and below is the screenshot of it.
So, even you will need to forward all these ports.
TCP & UDP 3074 to 3074, 3478 to 4380, and 27000 to 27050
In the occasion that forwarding the above Call of Duty: Black Ops Ports if not proves worthy for you, then you can try & put your computer's IP into DMZ+ mode. This will eliminate your computer from the firewall completely, opening all available ports. Because many times your firewall blocks the port.
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