If you do not have a VPC configured when creating your first ECS, the system automatically creates a default VPC. The security group policy of a default VPC allows data exchange only within the security group. As a result, ECSs in a default security group cannot be accessed from an external network. To remotely access an ECS in such a security group, you must configure the inbound rules of the security group.
The page providing details about the ECS is displayed.
The system automatically switches to the Security Group page.
The default source IP address 0.0.0.0/0 indicates that all IP addresses can access ECSs in the security group.