Why can't everyone connect to the VPN server on Win 2008 r2?

Question

VPN

There is a WIN 2008 R2 server with the configured VPN server.
It is not clear why I can not connect to it from any Internet. for example, from the phone through the mobile operator I can, but not through the home Internet. in general, it is not clear why it is possible to connect from some ip addresses, but not from others. error 800. tried to turn off the firewall, did not help.

Answer 1

Look on your home router to see if there is a checkmark next to alg pptp pass-through or something like that

Answer 2

I came across the fact that the IP issued to the client matches the one he has on the local network.
Let's say the subscriber has a 10.0.0.0/8 network, the same range is also specified in the PPTP settings. They intersect and hence the conflict.