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SPrabu
Staff
SPrabu
Staff
June 6, 2025

Troubleshooting Tip: Unable to access the Standalone FortiSwitch GUI: '500 Internal Server Error'

  • June 6, 2025
  • 0 replies
  • 957 views
Description This article describes the steps to troubleshoot a 500 Internal Server Error encountered while attempting to access the GUI of a standalone FortiSwitch.
Scope FortiSwitch Models.
Solution
  1. Verify if the default Fortinet Certificates are being used.

Use the following command to check the current certificate configuration:


FortiSwitch CLI:

 

show full-configuration system global


Confirm the output includes:


config system global
    set 802.1x-ca-certificate "Fortinet_CA"
    set 802.1x-certificate "Fortinet_Factory"

 

  1. Check for System crashes.

Look for any crash logs on the FortiSwitch:


diagnose debug crashlog read

 

  1. Collect debug logs for the GUI and HTTPS daemon.

Enable debug logging to gather more details:

 

diagnose debug application httpsd -1
diagnose debug application gui -1
diagnose debug cli 8
diagnose debug enable


These steps can help identify and resolve the root cause of the GUI access issue. If the problem persists, collect the logs and share them with Fortinet support with a TAC case.
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