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, we can use the following command:
lsof –i :8080
Don't forget to replace 8080 with the appropriate port number.
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.
The program for determining a program listening on a port for FreeBSD and DragonFlyBSD is sockstat and can be used as follows:
sockstat -4l | grep 8080
The previous command will show us the program listening on port 8080.
Once we have identified the program listening on port 8080, we can resolve the issues...