For some time (few days) I’ve been able to use 5G Unlimited plan to watch high quality videos on laptop and since my main connection is slow I also used it to download some updates from Steam for my PC, but after a short time, I can’t use it anymore with that service, not even login to friends’ tab; viewing “store” or “community” tab works fine, but I guess it’s because they’re using standard ports for web browsing (80/443). Watching movies is still fine.
The moment I change to other connection everything is working fine, so can I assume KPN is blocking it?