Technical Tip: Data on ‘Diagnostics and Tools’ menu of managed FortiSwitches fails to load on the FortiGate GUI interface

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Description	This article describes an issue observed in the Diagnostics and Tools section of managed FortiSwitches, where: • The Ports section fails to load and continuously displays a loading spinner. • The Cable Test feature shows incorrect port information, often displaying ports from a different FortiSwitch.
Scope	FortiGate v7.6.3.
Solution	In the Diagnostics and Tools section of a Managed FortiSwitch, the Ports section fails to load and continuously shows a loading spinner. Additionally, the Cable Test feature displays ports from a different FortiSwitch. This issue has been resolved in the following versions: v7.6.4 (available to download from the Fortinet support portal). v8.0.0 (scheduled to be released in February 2026). These timelines for firmware release are estimates and may be subject to change. General debug information required by FortiGate TAC for investigation: Debugs: diagnose debug console timestamp enable diagnose debug application https -1 diagnose debug enable Reproduce the issue. diagnose debug reset TAC Report: execute tac report Configuration file of the FortiGate. FortiGate Support Tool data: Troubleshooting Tip: Collect GUI slowness and errors debugs via Fortinet Support Tool.