Some KDE apps/services like geolocation (location.services.mozilla.org) and discovery does not deal with HTTP Code 407 correctly. They simply retries on and on the same connection immediately after it gets 407. The frequency is so high that it generates dozens of gigabytes of logs. It should, at least, wait a couple of seconds. In my site, the proxy authentication uses kerberos, but NTLM and basic are still valid options. The issue is that the moment the failed sw runs, it might not be a valid TGT. Normally you can stop the "DoS attack" signing out/in KDE. It happens with different KDE apps and maybe it is a QT bug (I also saw that behavior with OpenSUSE welcome app). STEPS TO REPRODUCE 1. Configure a proxy that requires authentication 2. Configure KDE to use it (without offering the credentials) 3. Use some affected apps. OBSERVED RESULT 4. a wave of failed authentications EXPECTED RESULT 4. some failed authentications but with a much lower frequency SOFTWARE/OS VERSIONS Linux/KDE Plasma: OpenSUSE Tumbleweed 20221120 KDE Plasma Version: 5.26.3 KDE Frameworks Version: 5.100.0 Qt Version: 5.15.7 ADDITIONAL INFORMATION