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akbci1
Visitor III
February 10, 2026
Question

Forti analyzer alert - Did not receive any log from device

  • February 10, 2026
  • 3 replies
  • 191 views

FortiGate appears offline in Forti Manager. Both Internet connections are online, but if I disconnect and reconnect the LAN cable between the FortiGate and Forti Switch, it shows as online in Forti Manager. However, after a few hours, it goes offline again.

3 replies

Stephen_G
Moderator
Moderator
February 13, 2026

Hello akbci1, 

 

Thank you for using the Community Forum. I will seek to get you an answer or help. We will reply to this thread with an update as soon as possible. 

Regards,
Stephen_G - Fortinet Community Team
Stephen_G
Moderator
Moderator
February 16, 2026

Hello,

 

We are still looking for an answer to your question.

 

We will come back to you ASAP. If anyone else has any ideas in the meantime, please feel free to contribute!

Regards,
Stephen_G - Fortinet Community Team
Stephen_G
Moderator
Moderator
February 17, 2026

Hi akbci1,

 

Please let me know if this helps:

 

1. Check Physical Connections

  • Cable Quality: Ensure that the LAN cable is in good condition and properly connected. A faulty cable can cause intermittent connectivity issues.
  • Port Status: Verify that the ports on both the FortiGate and FortiSwitch are functioning correctly. Check for any physical damage or loose connections.

2. Examine FortiLink Configuration

  • FortiLink Interface: Ensure that the FortiLink interface is correctly configured. You can do this by accessing the FortiGate interface settings and verifying the configuration.
  • Security Fabric Connection: Make sure the Security Fabric Connection is enabled. This can be done through the FortiGate interface settings.

3. Monitor Logs and Alerts

  • FortiGate Logs: Check the FortiGate logs for any errors or warnings that might indicate why the device is going offline.
  • FortiManager Logs: Similarly, review the logs in FortiManager for any relevant alerts or messages.

4. Firmware and Software Updates

  • Firmware Version: Ensure that both FortiGate and FortiSwitch are running compatible firmware versions. Sometimes, firmware mismatches can cause connectivity issues.
  • Upgrade Path: If necessary, consider upgrading to a more stable firmware version. Ensure you follow the correct upgrade path and review the release notes for any known issues.

5. Network Configuration

  • IP Address Conflicts: Check for any IP address conflicts within your network that might be causing the FortiGate to go offline.
  • VLAN Configuration: Verify that VLAN settings are correctly configured and that there are no misconfigurations causing network segmentation issues.

6. Consult Related Articles

  • Troubleshooting Guides: Refer to related articles such as the "Technical Tip: Managed FortiSwitch onboarding Troubleshooting Guide" for additional troubleshooting steps and insights.

Final Considerations

If the issue persists after following these steps, consider reaching out to Fortinet Support for further assistance. They can provide more detailed diagnostics and support tailored to your specific network setup.

Stephen_G - Fortinet Community Team