Ports are closed but iptables is disabled?

July 1, 2012 at 13:24:48
Specs: CentOS 6.0
I'm running CentOS Core on Amazon EC2's platform. I'm trying to open port 5060 and 69 but I can't get it to work. In EC2 I have the security group edited to open those ports, and I have even stopped the IPTables service, but I can't access those ports. If I use an online tool to test to see if they're open it reports those ports are closed.
Am I missing something? How could those ports be closed if I have them open in EC2's firewall, and have disabled iptables?

I'm running CentOS 6 on Amazon EC2. Is there another firewall or something else that could be keeping those ports closed? Thanks!

See More: Ports are closed but iptables is disabled?

July 1, 2012 at 13:45:44
Silly question, but do you actually have services running on those two ports? Without a program opening the port they are not going to show as open in an online tool. IPTables should be the only firewall on a Centos system, so stopping the service should let anything in (not a very good idea, although it sounds as if Amazon provide their own firewall).

I can't think why port 69 (TFTP) should be a problem if you are running a TFTP server, but be aware that some ISPs block port 5060 (Session Initiation Protocol).

If all else fails I'd say that your best bet is to talk to Amazon support.

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