SUMMARY
***
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***


STEPS TO REPRODUCE
1. My company uses a VPN that can be connected to using Juniper Network Connect.
2. Apparently, one of the certificates installed on the VPN server has expired. So attempting to connect to that VPN connection results in a prompt from KDE Daemon 

    Check failed for certificate from VPON server "<IP ADDRESS>
    Reason: certificate expired
    Accept it anyway?

with OK and Cancel buttons.

3. I click "OK" to connect nevertheless.


OBSERVED RESULT
Nothing happens. The VPN connection window closes without establishing a connection. 
After that it is impossible to establish new VPN connections via this or any other VPN connections - the connection dialog does not even come up/

EXPECTED RESULT
I can still connect to the VPN despite certificate expiration  (as implied by the KDE Daemon prompt) and/or the other VPN connections can still be established.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: 5.26.4
(available in About System)
KDE Plasma Version: 5.26.4
KDE Frameworks Version: 5.100.0
Qt Version: 5.15.7

ADDITIONAL INFORMATION