Yes, but it is disabled by default. To enable connection throttling, in the Alert Logic® console, navigate to Configuration > WAF > Websites > Manage Website of applicable website > Virtual Host under the ADC heading > HTTP request throttling status > Configure.
Note: Alert Logic® Web Security Manager Premier™ uses source IP. In an Amazon Web Services deployment, Source IP is always the Elastic Load Balancer directly in front of the Web Security Manager (WSM) appliance or group of appliances. Connection throttling by X-Forwarded-For IP address (the true client) is available in WSM 4.4 and beyond.