I created 3 intances in same VPC and same subnet.
2 instances A,B use same security group: WebSG (id: sg-ab)
instance C use security group: DbSG (id: sg-onlyc)
In WebSG, I add rule Alltraffic from source: sg-ab
In DbSG, I add rule: mysql from source: sg-ab
On A and B are unable to connect to mysql on C. A,B are unable to connect to each other.
I could ssh/https to 3 instances from my home.
Does anyone know why?
