If netstat doesn’t show the program listening on the correct port, you need to address its configuration before you go any further. If you make any changes because the incorrect service is listening, run the netstat command again.

When netstat shows the port is free, enable the correct service (for example sudo service vsftpd start).

If something else is listening on the port, you can disable the program by running sudo service httpd stop, or change its configuration so that it no Check your xinetd configuration to ensure that this behavior is acceptable. Something other than the expected service appears to be listening on.Testing the listening service for response using You need to test the service more thoroughly. The correct service is listening on the correct port.If the list of listening daemons is long, you can use grep to filter it.įor example, to filter out everything except the default web server port 80, run the following command: $ sudo netstat -plnt | grep ':80'Ĭommon outcomes include the following results:

Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name $ sudo netstat -plntĪctive Internet connections (only servers) That are listening on three different sockets. The following example shows the output for three common programs To list the TCP ports that are being listened on, and the name ofĮach listener’s daemon and its PID, run the following command: sudo netstat -plnt For more information about both commands, see the lsof and ss command manuals. However, the output returned when you use these commands might not resemble the output of the netstat tool. Many of the command flags contained in this article are the same when you run the lsof and ss commands. Note: You can also use the lsof and ss commands to check ports. Netstat is not affected by your firewall configuration. You need to run netstat on the server that is running the service. The port number), the daemon’s process identifier (PID), and the program Troubleshooting are the addresses that the daemon is listening on (including The connection details to consider during basic network daemon Server and the details of any connections currently made to them. The netstat command shows the services listening to ports on a Linux The next step is to ensure it’s listening on the correct network port. If you’re troubleshooting a service that you know is running normally,

Use tcpview check monitoring