Category: netstat

Install nc if needed

yum install nc

Run listener on port 3000

nc -l 3000 &
nc -l -k 3000 &

where -k is –keep-open will keep connection opened and allows multiple connections in listen mode

Check on the server’s side:

netstat -tunap |grep :3000

Output:

tcp        0      0 0.0.0.0:3000                0.0.0.0:*                   LISTEN      82786/nc            

Check from local machine:

$ nmap -p 3000 SERVERS_IP_ADDRESS

Output:

Starting Nmap 7.01 ( https://nmap.org