Troubleshooting Tip: How to fix 'SSL connection is...

esalija · 12-09-2025

Description This article describes how to resolve the ERR_CERT_COMMON_NAME_INVALID error for a captive portal using Google SAML for Chromebooks on FortiGate, which authenticates users and retrieves their usernames. Scope FortiGate. Solution The artic...

esalija · 11-11-2025

Description This article describes the issue of FortiSwitches using Hardware Switch as an Interface type going offline after updating the FortiGate from v7.6.2 to v7.6.4. The article provides a step-by-step workaround to resolve this issue. Scope For...

esalija · 11-05-2025

Description This article describes the issue of ULL interfaces being down after updating FortiGate to version 7.4.9. It provides a step-by-step guide to troubleshoot and resolve the issue. Scope FortiGate. Solution To troubleshoot the issue of ULL in...

esalija · 10-24-2025

Description This articles explain how to determine what caused an IP address to be quarantined due to DLP (Data Loss Prevention) or content analysis. Scope FortiGate, FortiProxy. Solution To investigate the quarantined IP, start by checking the DLP l...

esalija · 09-17-2025

Description This article describes the process of configuring SSL traffic mirroring with a focus on modifying the Destination MAC address at the policy level, allowing administrators to accurately duplicate SSL traffic for analysis or inspection. Sco...

esalija · 11-29-2025

Hi @kvsivasakthi In FortiGate, VIP (Virtual IP) lookup is performed before policy lookup. Here's how FortiGate processes the traffic in your scenario: 1. FortiGate will first check if there is a VIP configured for the destination IP address in the in...

esalija · 11-29-2025

Hi @Raj_Pandey - For minimal disruption, upload the new license to the secondary firewall in Cluster-B first. - This approach allows the secondary unit to reboot and update without affecting the active traffic flow.- - Once the secondary unit is upda...

esalija · 11-29-2025

Hi @Raj_Pandey, Yes, you can proceed with uploading the newly purchased licenses directly to Cluster-B. 1. Upload the new licenses to both nodes of Cluster-B. This will override the existing temporary licenses and update the serial numbers accordingl...

esalija · 11-28-2025

Hi @Raj_Pandey - To ensure a smooth transition and avoid any conflicts or errors, follow these steps: - Prepare New Licenses for Cluster-B:Download the new licenses for both nodes of Cluster-B from the FortiCare portal. - Apply New Licenses to Cluste...

esalija · 11-19-2025

Hi @RolandBaumgaertner72 To troubleshoot the issue of all FortiAPs showing as offline, follow these steps: - Use the sniffer command on the FortiGate to check if CAPWAP communication is occurring between the FortiAPs and the FortiGate: diagnose sniff...

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Technical Tip: Common_Name_Invalid error for the Captive Portal with Google SAML on FortiGate for Chromebook device

Troubleshooting Tip: FortiSwitches go offline after update v7.6.4

Troubleshooting Tip: ULL Interfaces down after the update of FortiGate

Technical Tip: How to determine what caused an IP address to be quarantined due to DLP or content analysis

Technical Tip: Change the destination MAC address for Mirror SSL traffic

Re: Dnat vip

Re: Reassigning/Transferrig FortiGate-VM Licenses Between Two HA Clusters (Cluster-A HA & Cluste

Re: Reassigning/Transferrig FortiGate-VM Licenses Between Two HA Clusters (Cluster-A HA & Cluste

Re: Reassigning/Transferrig FortiGate-VM Licenses Between Two HA Clusters (Cluster-A HA & Cluste

Re: 4 FortiAPs this morning offline - what can we do?

Troubleshooting Tip: How to fix 'SSL connection is...

Technical Tip: High CPU usage is triggered from IP...

Technical Tip: How to perform multiple certificate...

Technical Tip: Configure a new policy with an Auto...

Technical Tip: The HA Cluster license requirements

Re: Reassigning/Transferrig FortiGate-VM Licenses ...

Re: How to fortigate admin-lockout-duration clear

Re: Fortigate Evaluation License Offline Mode

Re: interface down!

Re: Is there any difference between the fortiguard...

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