To kill an application running on a specific port in Linux, you can use the fuser command or other tools like lsof and kill. Here are the steps:

Method 1: Using fuser Command

1. Identify the Process Using the Port:

   fuser <port_number>/tcp
   

   Replace <port_number> with the actual port number. For example, to check port 8080:

   fuser 8080/tcp
   

   This command will print the PIDs of any processes that have the TCP port 8080 open.

2. Kill the Process Using the Port:

   fuser -k <port_number>/tcp
   

   Replace <port_number> with the actual port number. For example, to kill processes using TCP port 8080:

   fuser -k 8080/tcp
   

   The -k option will terminate (kill) any processes that have the TCP port 8080 open.

Method 2: Using lsof Command

1. Identify the Process Using the Port:

   lsof -i :<port_number>
   

   Replace <port_number> with the actual port number. For example, to find the process running on port 8080:

   lsof -i :8080
   

   The output will display the process details along with the PID.

2. Kill the Process Using the Port:

   kill <PID>
   

   Replace <PID> with the actual process ID. For example, to stop the process with PID 12345:

   kill 12345
   

   This will send a termination signal to the process running on the specific port, causing it to stop.

Additional Notes

• If the process does not stop after sending the termination signal, you can use kill -9 to forcefully kill the process. However, this should only be used as a last resort, as it does not allow the process to perform any cleanup operations.
• Ensure you have the necessary permissions to stop a process. If you are not running the commands as a privileged user, you may need to use sudo before the commands to run them with elevated privileges