Comment # 10 on bug 1108570 from Alexander Krupp

With 15.1 the problem occurs every time after a suspend on a laptop, which is
quite annoying, especially when frequently suspending during a long meeting. 

Quickest solution so far has been to go to the nm-applet and open the
"Configure network connections..." dialog. After the dialog opens, the
connection succeeds. The dialog seems to do something to kded5, which enables
credential access. 

As per comment #9, the "kquitapp5 kded5; kded5 &" solution works, too.

Will check whether there is a systemd/user/session-hook after suspend which can
be used to automate that. Suggestions and ideas are welcome, however...