AWS SG - Security Group

Basically SG acting as firewall and control / regulate

1. Access to ports
2. Authorize IP ranges - IPv4 and IPv6
3. Control Inbound network
4. Control Outbound network

• Can be attached to Multiple Groups
• Locked to Region / VPC combination
• Live outside EC2 ( firewall outside EC2 )
• Always to good to use separate SG for SSH access
• App not accessible (time out) --> SG issue
• app gives "Connection Refused" --> then it's Application error or App not launched.
• Deafult --> All Inbound BLOCKED and Outbound ALLOW or Authorized.

SG used to filter and Allow In and Out.
In Red - blocked.




Advance Feature - Referencing other SGs via SG.