SUMMARY STEPS TO REPRODUCE 1. Go to site edf.fr (French electricity supplier) 2. Try to access user account ("mon compte") 3. OBSERVED RESULT The site returns an error : Access Denied You don't have permission to access "http://particulier.edf.fr/fr" on this server. EXPECTED RESULT Access to login. In the same time, it works correctly with Firefox. I tried several user agents without improvement. SOFTWARE/OS VERSIONS Windows: macOS: Linux/KDE Plasma: Kubuntu 20.04 (available in About System) KDE Plasma Version: 5.18.5 KDE Frameworks Version: 5.68.0 Qt Version: 5.12.8 ADDITIONAL INFORMATION
Need a change of user agent. Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/602.3.12 (KHTML, like Gecko) Version/10.0.2 Safari/602.3.12 for global. Incompatible with facebook.com, so a diffrent user agent has to be defined : Safari/602.3.12Mozilla/5.0 (X11; Linux x86_64; rv:57.0) Gecko/20100101 Firefox/57.0
Changing the user agent is not a solution. Defining a user agent that works for edf.fr implies that you cannot access some other sites that were accessible with a global user agent. It seems that there is something wrong with the management of different user agents for specific sites.
It seems also that defining many diffenrent user agents leads Falkon to crash. In this case, the only solution is to reboot as restarting Falkon is impossible.
Fin
Finally solved. Forget all the user agents proposed in the lists, they seem to be obsolete. Just use the user agent defined in Firefox, which is up to date : Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:81.0) Gecko/20100101 Firefox/81.0 Define just one global user agent and it will be fixed.