Troubleshooting Tip: How to resolve 'timed out while waiting for spectrum analysis data' issue for FortiAP-431G

[mradhika22]

Description	This article describes the issue when the Spectrum Analyzer is enabled on the FortiAP G-series profile on v7.2.10.
Scope	FortiOS v7.2.10, FortiAP-431G v7.4.4,build0713,241016
Solution	Go to WiFi and Switch Controller -> Managed FortiAPs. Enable all 3 radios or Radio1 and Radio2 to dedicated monitor. In the Managed FortiAP table, hover over the FortiAP so the context menu appears. Select Diagnostics and Tools. The summary pane appears. Select Spectrum Analysis tab -> - Select the Radio -> Start. An error 'timed out while waiting for spectrum analysis data' appears as follows. Workaround :  Enable dedicated scan globally on FortiAP profile: config wireless-controller wtp-profile     edit "FAP431G"         set ddscan enable  end Disable both 2.4 and 5GHz radio. Set Radio 3 to a dedicated monitor. In FortiGate CLI, enable spectral scan using the commands: exec wireless-controller spectral-scan <fortiap serial number> 1 on exec wireless-controller spectral-scan <fortiap serial number> 2 on  Check the output of spectral scan in FortiGate CLI 2 to 3 times using the command : get wireless-controller spectral-info <fortiap serial number> 2 get wireless-controller spectral-info <fortiap serial number> 1  Disable spectral scanning using the following commands from FortiGate CLI : exec wireless-controller spectral-scan <fortiap serial number> 2 off exec wireless-controller spectral-scan <fortiap serial number> 1 off  Similarly in FortiAP CLI, the output can be verified using the following commands: fap-tech spectraltool -i wifi2 spectraltool -i wifi1 spectraltool -i wifi0 rcfg Resolution: The issue is fixed in v7.4.x. The Spectrum Analysis data gets populated even when all Radios are enabled with Dedicated Monitoring. Related debug for Spectrum analysis in FortiAP: cw_diag debug sa 15 cw_debug on To disable the SA debug, use the command: cw_diag debug sa 0 Related document: Enabling spectrum analysis