Opening ec2 ports using security groups

theicfire asked:

I’m trying to open all ports up to a micro instance that I have set up, but it doesn’t seem to be working. This is what I have:

Using paping, I find that port 22 is open but 80 (and others that I can see) is closed. Is there something I’m missing?

My answer:

Are you actually running services on those ports? Did you open the ports in the server’s firewall? All ports but 22 are firewalled by default on Red Hat-derived systems, while Debian-derived systems ship with the firewall off.

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