Enable or disable ports in AWS EC2 server. Open or close network ports in AWS ec2

A security group acts as a virtual firewall that controls the traffic for one or more instances. When you launch an instance, you associate one or more security groups with the instance. You add rules to each security group that allow traffic to or from its associated instances. You can modify the rules for a security group at any time; the new rules are automatically applied to all instances that are associated with the security group. When we decide whether to allow traffic to reach an instance, we evaluate all the rules from all the security groups that are associated with the instance.

Security Groups for EC2-Classic

If you're using EC2-Classic, you must use security groups created specifically for EC2-Classic. When you launch an instance in EC2-Classic, you must specify a security group in the same region as the instance. You can't specify a security group that you created for a VPC when you launch an instance in EC2-Classic.

After you launch an instance in EC2-Classic, you can't change its security groups. However, you can add rules to or remove rules from a security group, and those changes are automatically applied to all instances that are associated with the security group.

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Security Group Rules
The rules of a security group control the inbound traffic that's allowed to reach the instances that are associated with the security group and the outbound traffic that's allowed to leave them.

The following are the characteristics of security group rules:

By default, security groups allow all outbound traffic.
You can't change the outbound rules for an EC2-Classic security group.
Security group rules are always permissive; you can't create rules that deny access.
Security groups are stateful — if you send a request from your instance, the response traffic for that request is allowed to flow in regardless of inbound security group rules. For VPC security groups, this also means that responses to allowed inbound traffic are allowed to flow out, regardless of outbound rules. For more information, see Connection Tracking.
You can add and remove rules at any time. Your changes are automatically applied to the instances associated with the security group after a short period.

Note
The effect of some rule changes may depend on how the traffic is tracked. For more information, see Connection Tracking.
When you associate multiple security groups with an instance, the rules from each security group are effectively aggregated to create one set of rules. We use this set of rules to determine whether to allow access.

Note
You can assign multiple security groups to an instance, therefore an instance can have hundreds of rules that apply. This might cause problems when you access the instance. We recommend that you condense your rules as much as possible.
For each rule, you specify the following:

Protocol: The protocol to allow. The most common protocols are 6 (TCP) 17 (UDP), and 1 (ICMP).

Port range: For TCP, UDP, or a custom protocol, the range of ports to allow. You can specify a single port number (for example, 22), or range of port numbers (for example, 7000-8000).

ICMP type and code: For ICMP, the ICMP type and code.

Source or destination: The source (inbound rules) or destination (outbound rules) for the traffic. Specify one of these options:
An individual IPv4 address. You must use the /32 prefix length; for example, 203.0.113.1/32.
(VPC only) An individual IPv6 address. You must use the /128 prefix length; for example 2001:db8:1234:1a00::123/128.
A range of IPv4 addresses, in CIDR block notation, for example, 203.0.113.0/24.
(VPC only) A range of IPv6 addresses, in CIDR block notation, for example, 2001:db8:1234:1a00::/64.
Another security group. This allows instances associated with the specified security group to access instances associated with this security group. This does not add rules from the source security group to this security group. You can specify one of the following security groups:
The current security group.
EC2-Classic: A different security group for EC2-Classic in the same region.
EC2-Classic: A security group for another AWS account in the same region (add the AWS account ID as a prefix; for example, 111122223333/sg-edcd9784).
EC2-VPC: A different security group for the same VPC or a peer VPC in a VPC peering connection.

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