ec2 instance unreachable from browser

First, i read everything i found about my problem but i am still stuck, so i launch my ec2 instance, with the good security group with the port 80 open, ssh as well (22) and ICMP (-1)

i can ping the ip, it works well, i can ssh, no problem, when a wget http://localhost on this instance it's working as well

It's a rails application i launch sudo rails s -p80 (to be on the port 80) but i have a ERR_CONNECTION_REFUSED

when i nstat on my instance i got this :

so i guess the port 80 is not open but i have no idea how to fix this.

Anyhelp ? thx