In the start of May 2017, one family-member suddenly experienced “No internet, secured” message hovering over the network icon down in the tray icon area. Sure enough, her machine wasn’t visible on my TeamViewer control panel either, so she was definitely off the grid. Why did her Windows 10 machine suddenly decide to drop network connection?
As always, I start to search the net for similar cases, and as always, tons of different results pop up. All sorts of suggestions too, with some of them pretty lame (“download this and that”, buy hey, we don’t have network access in the first place ). Well, searching the net and reading tons of answers, and then trying them out, is just the modus operandi in problem-solving.
The quick answer in our case was that Windows suddenly decide to favor the new address-regime in internet (the IPv6) over the old one (IPv4), and along the way, obviously introduce some errors! In our case we have an old router (DLINK 652) which knows nada about IPv6, and the result was that Windows 10 tries to connect/discover/communicate with some protocol that doesn’t exist on the other side of the line. The end-result is that Windows effectivly shoots itself in the foot, and can’t connect or communicate anymore!
Read more to see the details