I'm using aws ec2 to run a Linux server. I'm running perforce on it which listens on port 1666 by default, but I want it to listen to port 80.If I set p4d to listen on port 80, it fails saying it's in use by tcp/ip something. I don't access the server from the web, only via ssh so I don't mind losing http connection. I used ./p4d -p 80to set my port 
How can I make a service to run on port 80 in Linux? (Details)
services