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‎01-23-2026
Last activity: Jan 23, 2026 2:49:11 PM
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Troubleshooting Tip: License change issues on FortiGate-VM HA Cluster leading to Certificate mismatch and Sync problems

01-08-2026
Description This article describes several problems that may arise when re-licensing a FortiGate-VM HA cluster and how to resolve them. Scope FortiGate-VM, FortiOS 7.x. Solution When re-licensing a FortiGate-VM HA cluster the following issues might b...

Troubleshooting Tip: Azure SDN connector down with 'The provided client secret keys are expired' error

12-29-2025
Description This article describes the steps to resolve an issue where the Azure SDN connector is down with a 'secret key expired' error. Scope FortiGate, Microsoft Azure. Solution To verify the cause of the SDN connector going down, run the followin...

Technical Tip: Unable to open subpages with ERR_CONNECTION_CLOSED

12-19-2025
Description This article describes the workaround of ERR_CONNECTION_CLOSED accessing subpages. Scope FortiProxy. Solution When trying to open subpages of certain websites the it leads to the ERR_CONNECTION_CLOSED browser error. The error below will b...

Technical Tip: Configuring QSFP28 Port Splitting with 4×25G Breakout and Dual LAGs Using QSFP28-to-4×SFP28 DAC Cables

11-19-2025
Description This article describes how to enable QSFP28 port splitting on FortiGate to create four 25G subports (e.g., port17.1 to port17.4) and use them in two separate LAGs (LAG1 to SW1, LAG2 to SW2) using QSFP28-to-4×SFP28 passive DAC breakout cab...

Technical Tip: Multiple shortcut tunnels between the same spoke pair

11-18-2025
Description The article illustrates a dual-hub ADVPN topology. The key feature being demonstrated is that multiple independent shortcut tunnels can exist between the same pair of spokes. Scope FortiGate, ADVPN. Solution ADVPN implementation allows mu...
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