|process listening on 0.0.0.0||0.63||0.9||7810||30|
COMMAND, PID, USER - The name, the pid and the user running the program associated with the port. NAME - The port number. To find what process is listening on a particular port, for example, port 3306 you would use: sudo lsof -nP -iTCP:3306 -sTCP:LISTENCan a non-privileged user open a listening socket below 1024?
Non-privileged user (not root) can't open a listening socket on ports below 1024. Remember, we do NOT want to run your applications as the root user, but there is a hitch: your safe user does not have permission to use the default HTTP port (80).How to find what process is listening on TCP port 22?
For example, to find what process listens on TCP port 22 you would type: The output shows that on this machine port 22 is used by the SSH server: If the output is empty it means that nothing is listening on the port. You can also filter the list based on criteria, for example, PID, protocol, state, and so on.What is the difference between open and closed listening ports?
Each listening port can be open or closed (filtered) using a firewall. In general terms, an open port is a network port that accepts incoming packets from remote locations. You can’t have two services listening to the same port on the same IP address.