Instances not communicating across Availability Zones within a single region
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:
Subnet 1:
Subnet 2:
Solution
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.
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