Can't connect to this network - better diagnosis?

Solution 1:

I had the same issue several times. What fixed it for me was a series of command-line interface networking commands followed by a reboot. Give 'em a try, you've got nothing to lose!

netsh winsock reset
netsh int ip reset
netsh winsock reset catalog
netsh int ip reset reset.log hit.

I also entered the following commands, but I don't believe they did anything:

ipconfig /release
ipconfig /renew

... the Dell tech who helped me fix this the first time it happened used them. This command does do something, though:

netsh /flushdns

Now reboot the machine and it should connect to your Wi-Fi without any problem. Worked for me at least four times (until now, anyway... tried to install Windows Subsystem for Linux, rebooted, and now I've got the old "can't connect to this network" thing again, and none of these commands helps. Restoring to an earlier restore point didn't help, nor did removing the subsystem.