What is a Security Group?

A security group in AWS is a stateful virtual firewall attached to an EC2 instance or other AWS resource’s network interface. It controls which inbound and outbound traffic is allowed based on protocol, port, and source or destination.
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Security groups are stateful firewalls attached to individual AWS resources, while Network ACLs (NACLs) are stateless filters applied to an ..
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Troubleshoot VPC connectivity by testing the actual traffic path, then checking the components that can block it: routes, security groups, n..
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Common VPC peering failures fall into two groups: the peering connection never becomes active, and the connection is active but traffic stil..
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verify its state, routing, security controls, DNS, and CloudWatch metrics. Start with the most common failure: a private instance cannot rea..
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