Ports
Which Linux process is using a particular network port?
Seeing the 'address in use' error or need to find out which process is listening to a particular port on Linux? Here are the tools to find out!
Summary
Most network related services have to open up a network socket, so they can start listening for incoming network requests. It is common to find the TCP or UDP being used as the main communication protocol. In this article, we will check what ports are used by which Linux process.
Auditing processes and network services
Find out what process is listening to a port
Only one process can actively listen to a TCP or UDP port. We usually only discover this when another process is already running on a specific port, while we try to start another service: