Mixing upper and lower case if the IPS signature is case-sensitive (e.g., ). Troubleshooting False Positives as a User
A reputable VPN is the most effective way to encrypt your traffic, making it impossible for the firewall to inspect packet contents. Firewalls often block known VPN IP addresses.
Modern FortiGuard deployments often utilize SSL/TLS Deep Packet Inspection to read encrypted traffic. If an application uses certificate pinning or non-standard encryption, DPI can break the connection, resulting in a block or a protocol error. To resolve DPI-related blocks for legitimate applications:
Instead of lowering security for everyone, create a narrow policy for specific IP addresses. Create a new policy, Firewall Policy > Create New . Source: Define the specific IP address or User Group. Mixing upper and lower case if the IPS
If you are a testing FortiGuard in a lab environment you own, I can provide educational content on how IPS systems work, how to trigger rules for testing, and general security research methodologies within legal boundaries — just let me know.
If you believe a website is blocked in error, you can use these methods to gain access: Request an Admin Override
Enable, but set the Web Filter/IPS to a less restrictive profile or set to "Monitor" only. Create a new policy, Firewall Policy > Create New
Creating a clone of the "no-inspection" profile under Security Profiles → SSL/SSH Inspection and configuring an unused port for HTTPS can effectively disable SSL deep inspection for traffic on that port. This is a more advanced configuration that requires understanding of protocol port mappings.
It monitors traffic baselines to detect anomalies, such as brute-force attempts or port scanning.
Ensure the deep inspection or protocol validation parameters align with the software requirements running on your network. 4. The Risks of Security Circumvention not IPS. Check the block page:
Change the category rating of a specific site from "Blocked" to "Allowed." 2. Disabling FortiGuard Services Globally (Technical Tip)
Under , add the specific Signature ID. Change the action from Block to Monitor or Allow . 2. IP and URL Exemptions
Sometimes FortiGuard blocks because of or Application Control , not IPS. Check the block page: