Rails server not starting

`start_tcp_server': no acceptor (port is in use or requires root privileges) (RuntimeError)

I can confirm that this is a not a port issue. It happened after I changed by /etc/hosts file to use my custom domain name pointing to 127.0.0.1 but after I changed that rails server is not starting in any port.

the command I am using to start is rvmsudo rails s -p 80