Ensuring network security is perhaps the first step that you should take in making your Linux hosting secure. This is a very simple task that is also applicable to other operating systems like Windows, but is equally important to Linux servers. All you need to do is to discover the processes listening for connections on various ports. If youre not familiar with the procedure, dont worry, there are tools that can help you do this.
Some of the more important tools that you can use are the netstat and nmap commands. The netstat command will identify which ports are currently being listened on. On the other hand, the nmap is a network mapper that will identify the ports and services available on your server that are from other machines still within the network. Theyre pretty easy to access and the outputs will be very comprehensive.
When ensuring security for linux hosting, dont ever forget this step in changing your settings.