Troubleshooting tip: Error 'No route exists from s...

mle2802 · 12-03-2025

Description This article describes how to enable 'Log IPv4 Violation Traffic' under an Implicit deny policy when Security Fabric is configured. This applies to both root and downstream FortiGates. Scope FortiGate. Solution When trying to enable log o...

mle2802 · 12-02-2025

Description This article explains how to troubleshoot error code '-155' that occurs when uploading a CA certificate to FortiGate. The issue is caused by a mismatch between the system time and the certificate’s validity start time. Scope FortiGate. So...

mle2802 · 11-13-2025

Description This article describes how to troubleshoot the error 'certificate validation before EAP failed' when connecting to dial-up IPsec VPN after switching from signature to preshare key authentication. Scope FortiGate. Solution When switching f...

mle2802 · 10-18-2025

Description This article describes how to troubleshoot the issue with certificate warning when using a public CA signed certificate for captive portal. Scope FortiGate. Solution In this scenario, the captive portal is configured for WiFi SSID using S...

mle2802 · 10-14-2025

Description This article describes how to troubleshoot issue with resolving internal DNS queries. Scope FortiGate. Solution Follow the steps in this document to configure FortiGate as a DNS server FortiGate DNS server | FortiGate / FortiOS 7.6.4 | Fo...

mle2802 · 12-31-2024

Hi @tunhiama,Did you see the connection on FortiGate or traffic from the client?

mle2802 · 12-30-2024

Hi @rlewcosa,You can try this document to overcome the duplicate subnet issue https://community.fortinet.com/t5/FortiGate/Technical-Tip-How-to-configure-an-IPsec-tunnel-with-Overlapping/ta-p/242267Regards,

mle2802 · 12-27-2024

Hi @baqir,You can download the installer for older version at support.fortinet.com. Navigate to firmware download and choose the correct product. Please refer to this document https://community.fortinet.com/t5/FortiGate/Technical-Tip-How-to-download-...

mle2802 · 11-25-2024

Hi @Marcos_FDS1012,In case FortiGate on this side is doing DHCP, you can specify DNS server as remote side so you do not need to manually specify DNS.Regards,

mle2802 · 11-22-2024

Hi @HyTronix,You can refer to this document for more information https://community.fortinet.com/t5/FortiGate/Technical-Tip-Implement-Source-NAT-for-IPsec-interface/ta-p/224533

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Troubleshooting Tip: How to enable 'Log IPv4 Violation Traffic' under an Implicit deny policy when Security Fabric is configured

Troubleshooting Tip: Error Code '-155' when uploading a CA Certificate on FortiGate due to System Time mismatch

Troubleshooting Tip: IPsec VPN error 'certificate validation before eap failed' with IKEv2

Troubleshooting Tip: Prevent certificate warning when using public CA signed certificate for captive portal

Troubleshooting tip: Internal DNS queries are not resolved when FortiGate is used as a DNS server

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Troubleshooting tip: Error 'No route exists from s...

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