While the fix worked on one network it didn't on the other (192.168.1.2) - I can access the main router (.1) if I make 192.168.1.2 my default gateway. Still the original issue though...
I ran into this issue yesterday and fiddled around a whole day without any relief. I finally got it to work around 12 at night so I just wanted to let everybody know what I did in my specific case - which is why I registered at this forum.
I have two new laptops, an ASUS UX310 and a Lenovo. Both run Win 10 x64 and have been working until now. Our wifi at home is set up with a central router that assigns IPs via DHCP and two slave routers that extend the Wifi to different areas.
The Lenovo connected to the main router (192.168.1.1) and the other ones (.2 and .3) without any issues. However the ASUS only got a connection from the main router while connecting to the internet via the slaves always left me with "No Internet, secured".
Troubleshoot got to the point where it said "Default gateway not available." which was obviously wrong as I was using the Lenovo and my phone at the same time to google for answers.
To cut a long story short: I tried all the solutions the interwebs gave me. Updating the drivers, fuddling around with power settings and wireless, cmd adventures, disabling all the firewalls - you get the picture (if not, check here).
Nothing worked so I thought I'll use this awesome System Reset feature. Well, a couple of hours later I finally had Win 10 back on the drive (a bootloop in the ASUS screen prevented me from finishing the reset/repair so I had to swipe the partition to re-install it, jeeeez).
So I went through the setup and it asks you to connect to a Wifi. I tried connecting to one of the slaves...issue still persisted. I was broken. Tried everything, killed my whole Win 10 installation, all settings and crap and apps for pretty much nothing. But, all was not lost.
What fixed it in the end.
In the Wifi bar I clicked on the network and then properties. In the settings window that pops open, I changed "Random hardware addresses" from "off" to "on" and all of a sudden, pop!, there was light!
Wi-Fi Random Hardware MAC Addresses - Turn On or Off in Windows 10
I hope this solution makes things easier for a couple of people as I was pretty devastated when I tried everything and nothing worked.