Revokes an ingress rule in an Amazon Redshift security group for a previously authorized IP range or Amazon EC2 security group. To add an ingress rule, see <a>AuthorizeClusterSecurityGroupIngress</a>. For information about managing security groups, go to <a href="https://docs.aws.amazon.com/redshift/latest/mgmt/working-with-security-groups.html">Amazon Redshift Cluster Security Groups</a> in the <i>Amazon Redshift Cluster Management Guide</i>.