note: I report this to kded because the problem seems to be related to the way kde applications find out about network connection state and I can't find out how exactly this happens. kded seems to provide this information through dbus, so I chose it as "closest match". SUMMARY After several days of kmail not working, I noticed that akregator can't fetch feeds either. This along with Bug #424245 and several hours of triyng stuff led to the following summary: Applications not beeing able to get data from Network (with the "quality" of "Error Messages"): Akonadi (KMail, KOrganizer) - "Connection established - Offline" Akregator "Networking is not available" - the only useful :) Konqueror (http(s) only - sftp still worked) something like "File not found" (yes! "file"!) qdbus showed: back then (not working) | now after workaround (working) $ qdbus org.kde.kded5 /modules/networkstatus org.kde.Solid.Networking.Client.status 0 | 4 $ qdbus org.kde.kded5 /modules/networkstatus org.kde.Solid.Networking.Service.networks {} | SolidNetwork Configuration: I was using ifupdown | netplan.io (now that I uninstalled netplan, I'm not sure the system was actually using it...) Workaround that fixed everything: 1. uninstall netplan.io 2. install network-manager & plasma-nm 3. make network-manager manage wired connections 4. configure wired connection in plasma-nm the whole problem started only recently (probably after updating to 5.76.0) ... I don't want network-manager, because there is only one dhcp-wired-connection and no need to ever change network configuration STEPS TO REPRODUCE 1. uninstall network-manager OBSERVED RESULT no http for kde-apps EXPECTED RESULT no problems SOFTWARE/OS VERSIONS Distro: KDE Neon (focal) KDE Plasma Version: 5.20.3 KDE Frameworks Version: 5.76.0 Qt Version: 5.15.1 ADDITIONAL INFORMATION This is related to #322602 and (at least my version of) #424245 Non-KDE software was not affected (tested with vivaldi and the qt http example) It is not a user configuration problem - I had the same problems with a fresh user