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Security Group

Note

Timeout is most likely caused by EC2 security group

Introduction to Security Groups

Security Groups are the fundamental of network security in AWS
They control how traffic is allowed into or out of our EC2 Instances.
Security groups only contain allow rules
Security groups rules can reference by IP or by security group
Security groups are acting as a “firewall” on EC2 instances
They regulate:
Access to Ports
Authorized IP ranges - IPv4 and IPv6
Control of inbound network (from other to the instance)
Control of outbound network (from the instance to other)

Reference