Dear Jean-Pierre, Thank you for getting back to me. My regulatory settings are working, and so the errors might not be very important - however, it is important that know why they are happening. > Code 234 => exit(-EINVAL) > Could be that crda is started in a context where the COUNTRY environment > variable is invalid, or started with an argument (crda must be run without > argument). This is very a good suggestion - I can see that my COUNTRY environment is not set. However, when I set COUNTRY the error code gets replaced with -7. The CRDA always reports errors on startup, but my wireless regulatory domains are working normally. For example I can change them using the following commands:- # iw reg set XX # iw reg get Why do I still get warnings if the underlying mechanism is working OK? Best, Adam