AWS Security Groups

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Security groups are the fundamental of network security in AWS and they also act as a firewall on EC2 instances. It is the primary thing to solve the troubleshoot networking issues. They regulate access to ports, authorized IP ranges IPv4 and IPv6, control of the inbound (traffic from outside to inside ec2 or VPC)and outbound networks(traffic from inside to outside ec2 or VPC). All inbound traffic is blocked and authorized to outbound traffic by default.

It can be attached to multiple instances and good for maintaining one SG for SSH access. It is a regional level and VPC combination.

Error: 1.If you get an error like time out, then it would be an SG issue.

2.If you get a connection refused error, then it’s an application error.