Re: FortiClient vpn issue

cravikumar · 11-09-2025

Description This article describes how to troubleshoot and resolve the Let's Encrypt certificate renewal error. Specifically, it addresses the issue: 'Domain authorization for vpn.example.com failed. CA considers answer to challenge invalid'. Scope F...

cravikumar · 10-23-2025

Description This article describes an issue where an automation stitch configured to trigger an alert email during a device reboot fails to send the email during the actual reboot process. Scope FortiGate. Solution During test triggers, the email ale...

cravikumar · 10-22-2025

Description This article describes how to use NULL encryption on a FortiGate to intentionally bypass ESP decryption during controlled diagnostic testing. Scope FortiGate. Solution In some cases, such as troubleshooting packet loss or performance issu...

cravikumar · 08-22-2025

Description This article describes how to customize a replacement message on the YouTube embedded player using a video filter. Scope FortiOS 7.6.1+. Solution Starting from FortiOS 7.6.1, the video filter replacement message can now be customized by a...

cravikumar · 03-13-2025

Description This article describes why SSL VPN stops working after upgrading from v7.0.x to v7.2.x in the FortiGate-1500D model. The SSL VPN debugs show 'no shared cipher' and the browser displays 'SSL_ERROR_NO_CYPHER_OVERLAP': Scope FortiGate-1500D ...

cravikumar · 09-10-2024

Topology 1:Azure-VM --- S2S --- On-Prem Topology 2:Phy-FGT --- S2S --- On-Prem Topology 3:Azure-VM --- S2S --- On-Prem --- S2S --- Phy-FGT Is this your topology? If yes, you can just update the routing table and point the destination to the correct o...

cravikumar · 09-09-2024

What's the FOS version? Run below debugs and attach the output. dia debug resetdia debug application sslvpn -1dia debug application samld -1dia debug enable https://community.fortinet.com/t5/FortiGate/Troubleshooting-Tip-Companion-for-troubleshooting...

cravikumar · 07-30-2024

If you delete the services, you can't reference it under policy and objects but the services will still be active. Use local-in policy to block services. https://community.fortinet.com/t5/FortiGate/Technical-Tip-How-to-block-open-ports/ta-p/189671

cravikumar · 07-27-2024

Hello, What's the FortiClient version? At what percent the connection stop? Enable FCT debug and check the reason for failure. Refer to the link below on how to enable debug log in FortiClient. https://community.fortinet.com/t5/FortiClient/Technical-...

cravikumar · 07-24-2024

What's your topology? Run a sniffer and check the source mac of the incoming traffic and make sure it's the same as blocked mac. Sniffer: dia sniffer pack any "host x.x.x.x" 6 0 a https://community.fortinet.com/t5/FortiGate/Troubleshooting-Tip-Using-...

User Statistics

User Activity

Troubleshooting Tip: Let's Encrypt certificate renewal failed with error: 'Domain authorization failed and CA considers answer to challenge invalid'

Technical Tip: Alert emails are not being triggered when the FortiGate is rebooted

Technical Tip: Skipping ESP decryption using NULL encryption for troubleshooting in a lab environment

Technical Tip: Customize Video filter replacement message for YouTube embedded player

Troubleshooting Tip: FortiGate-1500D SSL VPN certificate errors after upgrading to v7.2.2+

Re: Forward traffic through Site to site VPN