Technical Tip: Blocking Chat GPT

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Description	This article describes how to block ChatGPT using an application signature.
Scope	FortiGate.
Solution	Prerequisites: The application control database has been updated recently (to make sure the signature is present). A firewall policy in proxy-mode (as a general need for Application Control). Deep-inspection is enabled. Follow the instructions in Technical Tip: How To Upgrade Application Control Definitions Manually to check the version. Next, navigate to Application Control under security profiles. Create a new application and filter override: Search for the OpenAI signature. Select the signature and then choose the action (Block). Select Add Selected once done. After completing the steps above, use the application control on the policy. This will block the ChatGPT applications. To block browsing, create one static URL filter under the web filter to block the Chat GPT wildcard, and use the same web filter on the policy as mentioned above. The following is the result when a user attempts to access OpenAI applications: If the requirement is to block other AI-related tools aside from ChatGPT, starting FortiOS version 7.4.1, a new FortiGuard web filter category is added for AI. The new category Artificial Intelligence Technology is added as a sub-category under General Interest - Business. The GenAI category is also added to the application control categories.  If the GenAI category is not available, check the application control signature database if running the updated version. Run the command below to check the database version: diagnose autoupdate versions | grep "Application Definitions" -A 6 Related document: Add FortiGuard web filter categories for AI and cryptocurrency