How to test your dedicated IP for opened ports

Ports on your network at home and at work are controlled by your computer’s firewall, sometimes your router, and sometimes your internet service provider.

But ports on a dedicated IP on a hosting account are opened by the host. Ports you don’t use should usually be closed by default for security reasons but if you need one opened to run a specific script or app, then your host can usually do that for you, depending on the port.

You can use online port scanners like http://www.yougetsignal.com/tools/open-ports/ to check if ports are opened, but a process needs to be running on the port for a tool like that to see that it’s opened.

For this tutorial we will be using the nc command, which is netcat, a simple Unix utility that reads and writes data across network connections, just so we will have a running process on that port.

So you can use SSH on the server and to test port 2195 for example you could run

nc -lk 2195

and while it’s running check 2195 and your dedicated IP using http://www.yougetsignal.com/tools/open-ports/.

Remember it will only show as open while the process runs so you need to check it while it’s running.


 
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