Skip to main content
mradhika22
Staff
mradhika22
Staff
March 26, 2025

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

  • March 26, 2025
  • 0 replies
  • 609 views
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.

 

Spectrum analysis timeout error.jpg

 

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.
 
working Spectrum analysis in 7.4.7FortiOS_5GHzband.png

 

working Spectrum analysis in 7.4.7FortiOS_2.4band.png

 

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:
      Terms & ConditionsAccessibility statement
      Thought Leadership Security Summit. Outpace New Threats with AI - enhanced defense. Tuesday, Septmeber 15, 8:30 AM - 2:30 PM PT. The Golf Club at Newcastle, WA.
      Fortinet Flag the Hack. Wednesday, August 26, 9:00 AM - 5:00 PM ET, COSM, Atlanta, GA.
      Virtual event | September 2026. SASE summit. The age of autonomous trust. Register here!