SUMMARY I was removing old saved Wi-Fi connections from the list via Connections — System Settings module. Each time I removed one, it gave me this weird error notification: > Failed to remove %connection_name% > > Error checking authorization: connection was deleted STEPS TO REPRODUCE 1. Remove Wi-Fi connection via Connections — System Settings Module. OBSERVED RESULT Error notification appears. EXPECTED RESULT No error. Or at least an error with a descriptive meaningful text which user can understand and take some actions about it. SOFTWARE/OS VERSIONS Arch Linux, KDE/Plasma lib32-libnm-glib 1.18.5dev+12+ga8746f48ca-1 libnm 1.24.2-1 libnm-glib 1.18.5dev+12+ga8746f48ca-1 networkmanager 1.24.2-1 polkit-qt5 0.113.0-2 ADDITIONAL INFORMATION Code responsible for posting this is Handler::replyFinished method in libs/handler.cpp, but it is not the origin. In this case, KDE/Plasma is merely a messenger, so don't shoot the messenger. It could add some more context and/or advice though. Originally posted at FreeDesktop Gitlab: https://gitlab.freedesktop.org/NetworkManager/NetworkManager/-/issues/489 Original issue text: === ratijas: I was removing old saved Wi-Fi connections from the list via Connections — System Settings module. Each time I removed one, it gave me this weird error notification: > Failed to remove %connection_name% > > Error checking authorization: connection was deleted  Who am I wronged in this world? What kind of message is that? What am I (as a user) supposed to do with that information? --- > Arch Linux, KDE/Plasma > lib32-libnm-glib 1.18.5dev+12+ga8746f48ca-1 > libnm 1.24.2-1 > libnm-glib 1.18.5dev+12+ga8746f48ca-1 > networkmanager 1.24.2-1 === Thomas Haller: NetworkManager uses PolicyKit for authenticating requests. That means, if your system user doesn't have permissions, then an operation will fail. You see your permissions with `nmcli general permissions`. Note that PolicyKit can also prompt for a password to authenticate the user. It's mostly KDE's responsibility to integrate an agent for PolicyKit. From the provided information it's not clear that this is an issue in NetworkManager. It looks either like a bug in plasma-nm or a misconfiguration of PolicyKit on your system. === ratijas: Shame on me, I installed my Arch Linux by guides and tutorials via installer script. I have little idea about PolicyKit and its configuration. I am more of a regular™ userⓒ in this field. Here is my `nmcli general permissions`: PERMISSION VALUE org.freedesktop.NetworkManager.checkpoint-rollback auth org.freedesktop.NetworkManager.enable-disable-connectivity-check yes org.freedesktop.NetworkManager.enable-disable-network yes org.freedesktop.NetworkManager.enable-disable-statistics yes org.freedesktop.NetworkManager.enable-disable-wifi yes org.freedesktop.NetworkManager.enable-disable-wimax yes org.freedesktop.NetworkManager.enable-disable-wwan yes org.freedesktop.NetworkManager.network-control yes org.freedesktop.NetworkManager.reload auth org.freedesktop.NetworkManager.settings.modify.global-dns auth org.freedesktop.NetworkManager.settings.modify.hostname auth org.freedesktop.NetworkManager.settings.modify.own yes org.freedesktop.NetworkManager.settings.modify.system yes org.freedesktop.NetworkManager.sleep-wake no org.freedesktop.NetworkManager.wifi.scan yes org.freedesktop.NetworkManager.wifi.share.open yes org.freedesktop.NetworkManager.wifi.share.protected yes So what was supposed to happen instead of that notification? System (KDE) should have prompted me for password and confirmation or something?
Based on the permissions you should be able to remove your own connections. I see this in your permissions: org.freedesktop.NetworkManager.settings.modify.own yes org.freedesktop.NetworkManager.settings.modify.system yes I now tried to remove a connection on my system and getting same notification, but I'm pretty sure this was not happening before so it might be actually a NetworkManager issue after all. I will respond to NM bug.
I saw the same notification a few days ago when I removed a wi-fi connection on neon unstable. The issue in NM tracker was closed without a solution.
Bulk transfer as requested in T17796
Looks like it has been unintentionally fixed after https://invent.kde.org/plasma/plasma-nm/-/commit/341a1db2f4503d30abd85ecb0622ee67c27838b0 I manually backported this commit to KDE 5 and the problem was fixed. As I understand it from the logs, without this patch, when you click on the remove connection button, two D-Bus deletion requests were sent simultaneously. Therefore, one request actually deleted the connection, and the second request returned at the same time with the error that the connection had already been deleted.
(In reply to Sergey Katunin from comment #4) > Looks like it has been unintentionally fixed after > https://invent.kde.org/plasma/plasma-nm/-/commit/ > 341a1db2f4503d30abd85ecb0622ee67c27838b0 marking as fixed then, reopen if the problem gets back on more recent releases