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If the limit is reached, new connections will fail. The stateful feature requires the security group to keep track of all authorized connections, and there is a limit for tracked connections. Security groups are stateful, meaning that after the incoming or outgoing traffic is allowed, the responses for that traffic will be automaticallyĪuthorized in the context of that specific security group. Security Groups are virtual firewalls protecting your ElastiCache client (EC2 instance, AWS Lambda function, Amazon ECS container, etc.) and ElastiCache cluster.