HTTP Transaction Rate Limiting (TRL) is a mechanism for limiting the number and/or rate of connections on a per user basis. This feature requires that the website be using HTTP Basic Authentication. When the Authorization header is present, the ServerIron will extract the username from the header and apply the appropriate TRL policy.
First, create a http-trl-policy based on maximum connections and/or connection rate.
Second, create a CSW rule to determine http-trl eligibility.
Lastly, create a CSW policy that refers back to the http-trl policy.
Review here for further info on HTTP TRL in security administration manual
Review the TRL section in security administration manual for further information on usage of traffic rate limiting feature in non web traffic scenarios. [hint: use TOC button to see other security/rate limiting features]