Technical Tip: Unexpected Behavior of UDP Session ...

kjay · 12-24-2025

Description This article describes how FortiGate processes DNS queries when DNS cache is available and how the behavior changes before and after the dns-cache-ttl timer expires.It also covers how to verify the DNS query flow using CLI commands and pa...

kjay · 12-15-2025

Description This article describes the checklist and troubleshooting steps to verify the integration status between FortiGate and a managed FortiSwitch. If the FortiLink connection or switch management is not functioning properly, the following items...

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 and v7.6.0-7.6.3. Solution The address object ta...

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Technical Tip: DNS cache behavior and how FortiGate handles DNS queries before/after dns-cache-ttl expiration

Technical Tip: How to verify FortiGate and FortiSwitch integration status

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

Technical Tip: Unexpected Behavior of UDP Session ...

KCS

User Statistics

User Activity

Technical Tip: DNS cache behavior and how FortiGate handles DNS queries before/after dns-cache-ttl expiration

Technical Tip: How to verify FortiGate and FortiSwitch integration status

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

Technical Tip: Unexpected Behavior of UDP Session ...

KCS

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