Galaxy Note 4 won't connect to hotspots

Second problem: connecting to hotspots, either open or password required.

The phone does show that it's connected to the wifi network. However, the browser (Chrome) won't load any pages and says there's no Internet connection. Other apps that require Internet access also don't work.

This happens if I'm in a coffee shop that has an open wifi that doesn't require a password.

I've also signed up for The Cloud, which provides a bunch of wifi hotspots in and around the City of London (and maybe elsewhere?). My password is stored on the phone, and, again, it shows that I'm connected, but the same problems occur. I've tried going to the Cloud's website and signing in that way. The page loads, but I can't sign in.

Hardware & other details:

1. Galaxy Note 4 model SM-N910F
2. Android version 5.0.1.
3. Security software version MDF v1.1 Release 5; VPN v1.4 Release 4.
4. Running Freedome version 2.0.20.2542 (though problems seem to occur whether Freedome is on or off)