how to open port by fuser

Shell
[email protected]:~# fuser -k  123/tcp
123/tcp:             11543
[email protected]:~# fuser -v -n tcp 80
[email protected]:~# fuser -v -n tcp 80
                     USER        PID ACCESS COMMAND
80/tcp:              root       3846 F.... nc
[email protected]:~#

Source

Also in Shell: