How to find out how the service is blocked?

Question

VPN

What are the ways to find out how the service (website, vpn) is blocked by the provider in order to bypass it further? (not RF).
Example: Many popular services are blocked in the "N" country, including vpn services blocked. Since when you want to use vpn services, they themselves are blocked.

Answer 1

oh well, China, what is there, you could call it they
use a private VPN with the correct protocol
, only there is little sense from those services, but there are their own, Chinese, substitutes