Arch Linux

mthu042

Member

Registered: 2025-01-25

Posts: 1

Re: NetworkManager 802-11-wireless-security.key-mgmt: property is missing.

Mb Late but for me this help

nmcli connection delete DIR-842 
nmcli device wifi connect <SSID> password <PASSWORD>

hjvt.dev

Member

Registered: 2024-12-11

Posts: 6

Re: NetworkManager 802-11-wireless-security.key-mgmt: property is missing.

I've been experiencing this with either of the backends for the past few months, and lately the aforementioned "solution" of deleting the connection stopped working. I now occasionally get this same error even on the first connection attempt, after purging saved connections and even rebooting for a good measure.

edit:
Just had to reboot the laptop to connect to either of the two wifi networks in my house

Just in case, I'm using gnome-keyring.

Last edited by hjvt.dev (2025-04-11 22:30:12)

seth

Member

From: Don't DM me only for attention

Registered: 2012-09-03

Posts: 72,546

Re: NetworkManager 802-11-wireless-security.key-mgmt: property is missing.

I suspect this is related to how NM stores the network key and whether something like kwallet or gnome-keyring is involved.

What DE do you use (or password/secret manager if there's a standalone one)?

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hjvt.dev

Member

Registered: 2024-12-11

Posts: 6

Re: NetworkManager 802-11-wireless-security.key-mgmt: property is missing.

I've been experiencing this with either of the backends for the past few months, and lately the aforementioned "solution" of deleting the connection stopped working. I now occasionally get this same error even on the first connection attempt, after purging saved connections and even rebooting for a good measure.

edit:
Just had to reboot the laptop to connect to either of the two wifi networks in my house.

So, uh, the only reliable way to connect to wifi for me right now is to

1. nmcli connection delete $ssid
2. systemctl restart iwd
3. nmcli dewice wifi connect $ssid

Either of the first two steps on it's own is not helping.

seth

Member

From: Don't DM me only for attention

Registered: 2012-09-03

Posts: 72,546

Re: NetworkManager 802-11-wireless-security.key-mgmt: property is missing.

You're not supposed to start iwd when using NM itfp.
Please post the output of

find /etc/systemd -type l -exec test -f {} \; -print | awk -F'/' '{ printf ("%-40s | %s\n", $(NF-0), $(NF-1)) }' | sort -f

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How to upload text · How to boot w/o GUI · Disable Windows Fast-Start! · Fix your xinitrc

hjvt.dev

Member

Registered: 2024-12-11

Posts: 6

Re: NetworkManager 802-11-wireless-security.key-mgmt: property is missing.

You're not supposed to start iwd when using NM itfp.
Please post the output of

find /etc/systemd -type l -exec test -f {} \; -print | awk -F'/' '{ printf ("%-40s | %s\n", $(NF-0), $(NF-1)) }' | sort -f

I don't start it, nor have it enabled. I presume NM itself starts it, since killing iwd and not restarting it renders NM `device wifi` commands inoperable.

seth

Member

From: Don't DM me only for attention

Registered: 2012-09-03

Posts: 72,546

Re: NetworkManager 802-11-wireless-security.key-mgmt: property is missing.

Are you https://wiki.archlinux.org/title/Networ … Fi_backend ? (That'S not default)
Please post your complete system journal for the boot:

sudo journalctl -b | curl -F 'file=@-' 0x0.st

after connecting tho your wifi.

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How to upload text · How to boot w/o GUI · Disable Windows Fast-Start! · Fix your xinitrc

Thomas Shelby

Member

Registered: 2021-11-03

Posts: 1

Re: NetworkManager 802-11-wireless-security.key-mgmt: property is missing.

also happened to me on arch after a recent update. deleting the connection in nmcli and reconnecting solved the issue for me

nmcli connection delete "NameOfWifi"

sgwzq

Member

Registered: 2026-01-26

Posts: 1

Re: NetworkManager 802-11-wireless-security.key-mgmt: property is missing.

I experienced the same issue this year. Here is what I met. Hope useful.

1. When I connect to my school network (no encryption, public), everything normal.

2. I went home and tried to connect my home WiFi (WPA2-PSK), it failed. I used the following command:

$ nmcli device wifi connect <MySSIDAtHome> --ask

it asks me for passwd. Though I input the correct one, it immediately failed and asked me to input again, again and again.

3. I removed all previous MySSIDAtHome files at

 /etc/NetworkManager/system-connections 

with root previleges and restarted NetworkManager.service using systemctl.
This time with the correct passwd,

$ nmcli device wifi connect <MySSIDAtHome> --ask

succeeded. But Mouse Clicks on KDE GUI to forget-and-then-reconnect still fails.
Only with the command line with

 --ask 

option can I reconnect my WiFi.

4. I tried to switch to iwd by changing configuration files at

 /etc/NetworkManager/conf.d/wifi_backend.conf 

This time when I use

$ nmcli device wifi connect <MySSIDAtHome> 

without

 --ask 

option, A KDE window prompted to ask me for passwd (despite warnings on terminal output).
I entered and it worked.
I then tried to forget-and-then-reconnect my WiFi in KDE GUI, and it also succeeded.

I think maybe it is a problem of the new --ask option, WPA2-PSK , and compatibility between NetworkManager and wpa_supplicant .
because
1. the older version did not meet this issue .
2. my school public network did not either.
3. iwd did not have the same issue as wpa_supplicant.
Hope these information useful.

Last edited by sgwzq (2026-01-26 16:19:28)

Lone_Wolf

Administrator

From: Netherlands, Europe

Registered: 2005-10-04

Posts: 14,700

Re: NetworkManager 802-11-wireless-security.key-mgmt: property is missing.

Please don't necro-bump

Moderator Note
closing this old thread

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Disliking systemd intensely, but not satisfied with alternatives so focusing on taming systemd.

clean chroot building not flexible enough ?
Try clean chroot manager by graysky