Same problem. Cablevision is my provider. I was once able to connect with this Galaxy 10.1 tablet to Cablevision hotspots with no issues whatsoever. I tried deleting the tablet from my authorized devices on Cablevision's website and reinstalling but to no avail. The device connects to my router at home but cannot connect to Cablevision's hotspots getting the message "authentication error occurred". Yes, I have the right username and password and I am able to connect to other networks.
I'm having the exact same issue. I can't connect to most networks, but some will work. Even with the same setup in terms of WiFi security one will work and another won't. None of my WiFi networks seem to work with my Note 10.1, though I connect multiple devices at home and they all connect without an issue. I also have a SIM card on the tablet and that seems to works perfectly but I can't be using only that data. No idea what's going on. I've tried everything, from factory resetting my tablet AND router to even getting a new router and setting up from scratch. Whether it will work or not seems to be totally random.