Security group blocks Internet ingress to Kafka port

# Restrict Kafka (9092) from Internet
resource "aws_security_group" "<example_resource_name>" {
  name   = "<example_resource_name>"
  vpc_id = "<example_resource_id>"

  ingress {
    from_port   = 9092
    to_port     = 9092
    protocol    = "tcp"
    cidr_blocks = ["10.0.0.0/8"] # Critical: not 0.0.0.0/0; restricts access to avoid Internet exposure
  }
}

# CloudFormation: restrict Kafka (9092) from Internet
Resources:
  <example_resource_name>:
    Type: AWS::EC2::SecurityGroup
    Properties:
      GroupDescription: Restrict Kafka 9092
      VpcId: <example_resource_id>
      SecurityGroupIngress:
        - IpProtocol: tcp
          FromPort: 9092
          ToPort: 9092
          CidrIp: 10.0.0.0/8  # Critical: not 0.0.0.0/0; restricts access to private range to avoid Internet exposure