My school blocks VPNs. I require a VPN to stay private so I can log into my apps. https://www.youtube.com/watch?v=FcT6i6k0m3w
The idea is, there are several ways this could happen.
- IP blocking VPN servers
- Domain blocking. block the VPN website so the App can’t connect to the APIs
- VPNs set up Mirrors so that if one domain is blocked or down, use the other
- Deep packet inspection
- Port blocking. Blocks the usual suspects, PPTP, L2TP, SSTP, etc.
- QoS(Quality of Service) filtering.