Technical Tip: Unexpected Behavior of UDP Session ...

kjay · 11-17-2025

Description This article describes a scenario where FortiGates were automatically upgraded to v7.4.9 even though a valid FMWR (Firmware & General Updates) license was installed. The auto-firmware-upgrade feature was explicitly disabled in the configu...

kjay · 10-13-2025

Description This article describes a phenomenon that can cause certain types of local traffic (such as DNS queries) to be sent through the VPN tunnel instead of the intended routing path when using a policy-based IPsec VPN. This can occur even when t...

kjay · 09-17-2025

Description This article describes an issue where the Address object table on FortiGate devices cannot be filtered using CIDR notation (for example, /24) after upgrading to v7.4.x. Scope FortiGate v7.4. Solution The address object table supports only...

kjay · 09-04-2025

Description This article describes an observed anomaly in FortiGate systems where the 'UDP session duration' recorded in Forward Traffic logs may appear inconsistent with the configured session timeout values. Scope FortiGate before v7.4.2. Solution ...

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Technical Tip: Unexpected automatic firmware upgrade despite FMWR license validity and auto-upgrade disabled

Technical Tip: Workaround for local traffic being sent through the tunnel when using Policy-Based IPsec VPN

Troubleshooting Tip: CIDR Filter Not Working in Address Object Table on FortiOS v7.4.x