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I have the following instances, they are in the same VPC and region but different AZs, both of them are in the same SecurityGroup.

Subnets:

  • us-west-2a instance-a 172.31.32.0/20
  • us-west-2b instance-b 172.31.16.0/20

These two instances are not able to communicate with each other. What do I need to do to enable communication between these two AZs?

Here is the main route: enter image description here

Subnet 1: Subnet 1

Subnet 2: Subnet 2

henrycarteruk
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Danny D
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1 Answers1

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You have to open the needed ports in the SecurityGroups of the EC2s. You should also look into your subnets and the routing tables of these subnets or your VPC.

André Veelken
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  • both of them are in the same security group does – Danny D Mar 21 '17 at 15:50
  • I was working with the assumption that since both instances are using the same securityGroup , the issue had to be routing table but . even if they are with in the same security group, i had to open ports by self referencing the security group . – Danny D Mar 21 '17 at 22:19