Comment # 1 on bug 1155639 from Josef Reidinger

(In reply to Sebastian Makowiecki from comment #0)
> Fresh Tumbleweed install, when trying to establish connection to a WPA-PSK
> protected WLAN network the 'yast2 lan' tool exits silently, the wireless
> interface stays down with no apparent effect. The only symptom/indication
> (besides the lack of connection) of the things not going right is the error
> of the wicked systemd service in the form of ���WIRELESS_WPA_PSK value not
> specified'.
> 
> The solution/workaround is to manually add the WIRELESS_WPA_PSK='passphrase'
> line to the wireless interface wicked configuration file at
> '/etc/sysconfig/network/ifcfg-wlp4s0' followed by the restart of thw wicked
> systemd service. If at any time after that the 'yast2 lan' tool is used
> again the line disappears from the file and the procedure need to be
> repeated.
> 
> This issue was briefly discussed in the forum at:
> 
> https://forums.opensuse.org/showthread.php/538061-Wicked-can-t-connect-WLAN-
> WIRELESS_WPA_PSK-value-not-specified-systemd-wicked-unit-error?p=2918607

Thanks for report. Can you please attach your yast logs? (output of save_y2logs
)
It will help us to point to specific part of code responsible for it.

Thanks