I hope this advice helps someone, I spent days scouring threads trying to find an answer for why my Windows 10 wireless worked flawlessly for a full 48 hours after I upgraded and then just stopped! Here's what happened to me and how I fixed it.
OS:
Windows 10 Pro 64Bit
WIFI NETWORK ADAPTERS USED:
Qualcomm Atheros AR5BWB222 Wireless Network Adapter (Built into Motherboard)
Netgear WNDA3100v2 N600 Wireless Network Adapter (USB Wifi Dongle)
SYMPTOMS:
* Qualcomm Wifi worked flawlessly for almost 48 hours after upgrading from Win7 to Win10. No hitches.
* On 3rd day, booted system and everything seemed normal, Wifi connected, no yellow exclamation mark. Internet detected and flowing normally according to the Qualcomm Wireless adapter... BUT!
* All internet reliant apps not working e.g Steam, Team Viewer, Spotify, Dropbox, AV updates.
* Go to any browser; Windows Edge, Chrome or Firefox, cannot browse to any website.
* Checked 'Device Manager' All adapters functioning without issue. Un-installed & Re-installed all just in case.
* Installed Netgear USB Wifi adapter to test, same symptoms (And Netgear state it's Windows 10 compatible)
* Tried installing a Legacy Wifi adapter - still no luck.
* Had 'Tunngle VPN' installed, other threads advised to remove any VPN's and re-install. I did this but no change.
MY SOLUTION:
Just as I was signing up to this website to get some answers I thought back to what I had last installed on my PC. I had updated my Bit Defender Internet Security 2015 software just before my previous shutdown. I though maybe its firewall is up to something weird... Sure enough I turn it off and BOOM! Internet!
* The culprit stopping my internet but causing all adapters to think I was still connected was an annoying wee setting under the advanced settings of my Bit Defender Firewall called 'Block Internet Connection Sharing', I switched this setting off and all is peaceful in the world again. (See attached screenshot - top setting)
Attachment 28043
It maybe worth checking your firewall even if it isn't Bit Defender for a similar setting. I hope this information saves someone much frustration and wasted time.
Willsy