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Find out which process is using which port

On a Linux server, you can use the following commands to find out which processes are listing on certain ports:

sudo lsof -i -P -n | grep LISTEN
sudo netstat -tulpn | grep LISTEN
sudo lsof -i:80 ## see a specific port such as 80 ##
sudo nmap -sTU -O IP-address-Here

On a Windows server, you can use the following command to find out all the ports being used by your applications on the server:

netstat -a -b

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