Shutdown unnecessary services listening on your Linux machine…!
It is really important that your system have the least and absolutely necessary services running, especially if it’s a public server. Okay, one might be thinking that they’ve got their firewalls up and running, blocking all the unnecessary ports and why should you bother? What if someone exploits a flaw in your webserver and find an even worse flaw in your blocked process to gain root access? You do let all packets to and fro loopback interface don’t you?
Well anyway lets get to the point. There are several methods of listing the ports your server are listening to. I prefer Nmap - a port scanner. Most of the time all your processes will listen on all available interfaces unless you specifically make a certain process to listen on a certain interface only.
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