ec2: cannot open port 5080 on windows instance

Question

Hi there,

I'm pretty new with ec2, firewall settings etc, so I might be missing something obvious, but:

• I've created a 'getting started with windows' instance
• with a security group that has 5080 specified
• and is associated with an elastic ip

On the instance I have a red5 server running. when I run the server it on 127.0.0.1:5080, i can access it from a browser on that instance, so I know the server works.

When I run it on the elastic IP however, I can't connect to it, neither from within the instance nor from outside.

when I run telnet 75.101.147.86 5080 from the outside world i get 'connection refused'

Any clues on how to debug this would be highly appreciated!

Thanks in advance,

Martin

Answer 1

In the AWS management console.

1 goto Amazon EC2 tab

2 Click on Instances and note the Security Group Name from the Security Group column for the instance you want to open it for.

3 Click on the link Security Groups

4 Click on the Security Group Name from step 2.

5 You should see a dropdown that says SSH, click it and select Custom..

6 Enter:

 Protocol                  TCP
 From Port                 5080
 To Port                   5080
 Source (IP or Group)      0.0.0.0/0       -- NOTE 1

7 Click Save.

If you need UDP also, then repeat using Protocol UDP in step 6.

NOTE 1: Read : http://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing for more info... but don't try to limit the subnet until you have it working for the world.

If it doesn't work after that then you may have a firewall on the instance. I'm more of an ubuntu guy, but try this : http://www.cyberciti.biz/faq/disable-linux-firewall-under-centos-rhel-fedora/ for RedHat