How to open a new port in aws server

1. Check the instance for to know in which security group

 you are a member :-

  Security Groups: quick-start-1

2. Then go to "Network Security" and expand the list and
   Select `Security Groups`.

 In this several security groups are defined. and select your instance's `security group`.

  In that there are two tabs `Details` and `Inbound`.

  Select Inbound

3. Select "Create a new Rule" = HTTP --- select the rule

                  you want, here it is HTTP 

          "Source "   = 0.0.0.0/0  ---- from any source and

                     click "Add Rule" tab.

4. Finally "Apply Rule Changes"

5. And take your public DNS in Browser 

     http://ec2-107-20-48-247.compute-1.amazonaws.com

 If you are not getting the default page, Go to your instance and check is there any iptable rule or not.

 # iptables -L
   
   If it is there just flush the rule and try
 
 # iptables -F

 http://ec2-107-20-48-247.compute-1.amazonaws.com