Examine which process using the port (lsof)

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Linux

You could also use lsof command to show which process using the specific port. The command accepts multiple port numbers with i option.

# lsof -i :445
COMMAND  PID USER   FD   TYPE DEVICE SIZE NODE NAME
smbd    2757 root   18u  IPv4   5867       TCP *:microsoft-ds (LISTEN)

# lsof -i :445,901
COMMAND  PID USER   FD   TYPE DEVICE SIZE NODE NAME
xinetd  2655 root    5u  IPv4   5630       TCP *:swat (LISTEN)
smbd    2757 root   18u  IPv4   5867       TCP *:microsoft-ds (LISTEN)