Squid Proxy Server 3.1: Beginner's Guide

Time for action – finding the program listening on a specific port

To resolve this issue, we first have to find out which program is listening on the port in question. The process of finding out the program listening on a port depends the operating system we are using. The following methods are used for popular operating systems:

For Linux-based operating systems

For Linux-based operating systems, we can use the following command:

lsof –i :8080

Don't forget to replace 8080 with the appropriate port number.

For OpenBSD and NetBSD

For OpenBSD and NetBSD, we can use the fstat command as follows:

fstat | grep 8080

This will give us a list of connections involving port 8080.

For FreeBSD and DragonFlyBSD

The program for determining a program listening on a port ...