Add a security group to itself so servers in that group can communicate with each other using all protocols and ports, on private IP addresses.
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Servers in the same security group can communicate with each other over both private and public IP addresses, on the ports that are explicitly open to those addresses in the servers' security groups.
In general, it is best to set up servers in your configuration to communicate with each other only over private IP addresses. To allow communication across all ports over private IP addresses for all servers in a security group, you can add the security group to itself. This is similar to adding a security group to another security group, except that it applies to servers in the same security group rather than another, external security group.
In the example below, the group "Standard" is used.
Warning: Ensure that the group name is spelled correctly.
After you add the "Standard" security group to itself, all servers in the "Standard" security group can establish connections (i.e., send requests) to other servers in that security group, on any ports that security group "Standard" instances are listening on. Connections are established over private IP addresses.
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