How to understand the reason for blocking the RKN?

Question

Computer networks

The question is already beaten in many respects, but I can’t really understand what is happening and how it is wiser to behave.
There is a VPS on it, the site is spinning, OpenVPN and mtproto-proxy. A few days ago I noticed that my site stopped opening and the connection to the proxy stopped going through. But only from a mobile phone (MTS provider). Interrogated friends. 80% have the same problems. From home and from work, everything opens normally.
However, there is such a moment. When moving around the city (Moscow), there are zones in which the connection is successful.
As a result, I can not understand the logic in any way. Do they have different bases or what? Why does it work here, but doesn’t work there even within MTS itself?
What is the easiest way to check all this and how to protect yourself?
The VPS provider seems to know how Ipv6. Will it help to avoid blocking (you need a VPN and a proxy, don't care about the site).
And another sub-question. How to understand that only this IP or the entire subnet is blocked?

Answer 1

"How to understand the reason for blocking the RKN" - no way, even a cat licking its scrotum has much more reasons for this than the RKN reasons for blocking everything in a row. The most likely option is that they blocked it because they found an mtproto proxy on it, under the far-fetched pretext of fighting Telegram.
Will IPv6 help to avoid blocking - most likely yes, because there are very few providers providing IPv6 in Russia, and those that exist most often simply do not bother with IPv6 filtering.

Answer 2

Enter the IP address of your server in the form https://blocklist.rkn.gov.ru/ If the site is indeed blocked, then the reason for blocking will be indicated there. If not, then you should contact the technical support of the provider that has problems.

Answer 3

How to understand the reason for blocking the RKN?

Obviously, look in the registry.
Another thing is that blocking can be illegal. But you can only complain about this in those. support, and there your brains can soar for a long time, although they can immediately help or send.
For example, mobile operators like to block p2p traffic. What difference does it make to them, what kind of traffic, if the tariff is paid? But apparently there is a difference. They bully, in short. And what are you going to do here? You can score. You can leave. And you can use p2p through VPN - and in fact the traffic will be the same, only through one place.
You can use the RKN Alert extension - it can search the RKN database by ip. True, it works fine only if there is access to the site.

Example