There may be situations in which it is desirable to dynamically implement a rule on the firewall in response to detecting a particular pattern of user activity. However, the software code required for tracking user activity, identifying patterns of user activity, and deciding what action to take may be relatively complex. Deploying such software code on a firewall increases the complexity of the firewall. For example, the firewall can no longer be “stateless”. In some embodiments, the destination server works in combination with the firewall. The destination server monitors traffic to determine particular patterns of user activity. In response to a particular pattern of user activity being detected, an appropriate rule is established and the firewall is sent a command to implement the rule.