Not only am I connected to a network. But I am also connected to the internet, as you can see by the downloading. Still the pop up warning never goes away, even after repeatedly closing it - which is but a slight annoyance.
Acer Aspire v3 772G Laptop
Qualcomm Atheros AR9462 Wireless Network Adapter
Debian 9 Stable, Kernel Version 4.9.0-8-amd64
KDE Plasma desktop 5.8.6