# File lib/ec2/right_ec2.rb, line 847
    def revoke_security_group_IP_ingress(name, from_port, to_port, protocol='tcp', cidr_ip='0.0.0.0/0')
      link = generate_request("RevokeSecurityGroupIngress", 
                              'GroupName'  => name.to_s,
                              'IpProtocol' => protocol.to_s,
                              'FromPort'   => from_port.to_s,
                              'ToPort'     => to_port.to_s,
                              'CidrIp'     => cidr_ip.to_s)
      request_info(link, RightBoolResponseParser.new(:logger => @logger))
    rescue Exception
      on_exception
    end