Scenario: A Citrix Engineer has enabled the Learn function for a Citrix Web App Firewall profile.
After a period of time, the engineer notices that Citrix Web App Firewall is no longer learning any new rules.
What would cause Citrix Web App Firewall to stop learning?
The Citrix Web App Firewall Learn database has a capacity limit of 20 MB. Once this limit is reached, the Web App Firewall stops learning any new rules. To continue learning, the existing learned rules must be reviewed, and the database needs to be cleared or space needs to be freed up by either approving or ignoring some of the learned rules.
D. The Citrix Web App Firewall Learn database has reached its capacity of 20 MB. The learning feature of the Citrix Web App Firewall stops learning new rules once the learn database reaches its size limit, which is approximately 20 MB. This limit corresponds to around 2,000 learned rules or relaxations. To resume learning, the engineer would need to review the existing learned rules and either approve or ignore them to free up space in the learn database.