No internet access with wifi tethering (mobile hotspot)

When I use wifi on my PC to connect to my router/modem, internet works fine.
But when I connect to my Android phone's access point (tethering) I don't get internet access.
You might think it's a problem with the Android phone, but other Android devices can connect to it and use the internet just fine.
So it's only my Windows PC that doesn't get internet, or rather the combination of Windows PC+Android phone access point.

Does anyone have any ideas? (BTW, I have the same problem on Windows 7. Also, tethering over USB works fine.)

edit: it looks normal
Unlike the working connection (router/modem) the "Connection-specific DNS Suffix" entry is blank. But I read elsewhere that that shouldn't be a problem...

Just a shot in the dark -

I once had this problem when I added a new WiFi adapter last year. In my case, Bitdefender was blocking access through the new adapter. I temporarily removed BitDefender & the problem disappeared.

I ditched Bitdefender permanently soon afterwards & the only explanatory note I can find now was that BitDefender had, without my noticing, been setting the new adapter up in Stealth mode and I had to set the Firewall, Adapter entry to Trusted. Just going on memory, I think it was setting Firewall, Adapter entry to Trusted that was the real solution and the Stealth mode note proved to be a red herring.

Best of luck,

Denis