I had this issue reported by community member. Then I tried and I'm able to reproduce it on my machine as well. After connecting to the secured WiFi network through knetworkmanager, I can't connect to the internet. My WiFi interface gets correct IP address, but resolv.conf is empty (there is an initial comment) and there is no default route. But when I use nm-tool, I see that networkmanager is aware of correct default gateway and nameserver.