When someone talks about wanting to check open ports on a computer, they usually aren't talking about physical ports, like where you might plug in a monitor or a USB stick. Instead, they're ...

Test if Firewall is blocking a Port. Check which Ports are being used. Also learn how to check which process or service is using the open port.

System and network troubleshooting often involves checking and obtaining information about ports to ensure functionality and determine the source of problems. Learn handy tips to help keep systems ...

Port Query (PortQry.exe) is a command-line utility in the Windows operating system that you can use to help troubleshoot TCP/IP connectivity issues.

One thing to check on your end is your router. Sometimes routers' default settings can block ports that games like Black Ops 2 need to connect to servers.