Answers to common questions about security groups, including stateful filtering, the default group, rule edits, IPv6, deny rules, deletion, and billing.

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Security Groups FAQ

Are security groups stateful?

What happens if I don't choose a security group for an instance?

Does editing a rule interrupt traffic?

Can I create deny rules?

Can I use IPv6 addresses in rules?

How do I allow SSH only from my own computer?

How do I allow traffic between instances that share a group?

Do rule changes apply to running instances?

Why can't I delete a security group?

Are security groups billed?