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

mle2802 · 01-16-2026

Description This article describes how to troubleshoot issues with the RADIUS server stuck in the connecting state. Scope FortiGate. Solution After configuring a RADIUS server on the FortiGate, the connection status is stuck at pending, and no errors...

mle2802 · 01-06-2026

Description This article describes how to troubleshoot the issue with wrong username displayed on the FortiGate using SAML SSO for authentication. In this example, IPsec VPN is used with Azure SAML SSO. Scope FortiGate and Azure SAML SSO. Solution Af...

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 · 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: RADIUS server stuck at 'connecting' state when configuring a RADIUS server on GUI

Troubleshooting Tip: Wrong username display wtih SAML SSO authentication

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

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

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