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Serxhio
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Staff
‎12-20-2025
Last activity: Dec 20, 2025 3:42:26 PM
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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...

Technical Tip: ARP table & Forwarding database in Transparent mode

08-28-2025
Description This article explains the forwarding decisions using the ARP table and FDB in Transparent mode. Scope FortiGate v6.0+. Solution In transparent mode, the Address Resolution Protocol (ARP) table is used in the following situations: For IP t...

Technical Tip : VLAN forwarding & Unknown VLAN in Transparent mode

08-27-2025
Description Trunk VLAN forwarding logic handling unknown VLANs in transparent mode. Scope FortiGate 6.0+. Solution VLAN forwarding:VLAN forwarding allows forwarding all the VLAN traffic of a trunk that was connecting two network devices, as well as w...
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