Troubleshooting Tip: '500 Internal Server Error' on FortiSwitch GUI after upgrade to 7.4.7

Description

This article describes debugging steps for a '500 Internal Server Error' displayed on the FortiSwitch GUI after upgrading it to FortiSwitch OS 7.4.7.

Scope

• FortiSwitch models below any of the following:

  • FS-108E, FS-108E-POE, FS-108E-FPOE, FS-124E, FS-124E-POE, FS-124E-FPOE, FS-148E, FS-148E-POE, FS-224E, FS-224E-POE, FS-248E-POE, and FS-248E-FPOE.

• FortiSwitch OS 7.4.7.

Solution

Run the following debug commands in the FortiSwitch CLI:

diagnose debug application gui -1ndiagnose debug application httpsd -1ndiagnose debug cli 8ndiagnose debug enablen<!-- Reproduce the failure by trying to manage the FortiSwitch via GUI -->n<!-- After capturing the issue, stop the debugs by executing commands below -->ndiagnose debug cli 0ndiagnose debug disable

If the debug output contains the following log, upgrade to 7.4.8 to fix the issue.

access_res_check.c[ 88] : Received '/access_res_check' request from 'xx.xx.xx.xx'

If the debug output does not match the log above, send out the debug command outputs to the TAC team and receive further instructions.