Problems with RDP between two offices with the same provider, what could be wrong?

Question

Computer networks

Once upon a time there was rdp access to the file storage in the office. Someone worked in 1s, someone pulled files. And there is a second office, from which the connection also went. Providers are the same, white IPs in both offices, everything was fine. BUT! At what point I can’t say, but access from office2 was lost. Moreover, they did not immediately notice, since access from all other places remained. From a mobile operator, from home, but the devil knows where there is access, there is access to the local area inside the office, and from office2 - shish. That is, people both worked from home or on a local network, and they work. And office 2 is in the span. For two years everything worked, the settings of the routers in the offices did not change, no one set anything on the final machine (and that is access, do not forget). The provider scratched his turnips, checked on the "test stand" and said that they say everything is in order, they do not block anything. I'm starting to believe in the supernatural.
If the information is useful - domra provider, ports forwarded from standard ones. That is, I'm sure of the configuration, because. Office 2 is the only problem.

Answer 1

What kind of hardware / software route traffic in office1 and office2?
Procedure:
1. check ping from office1 to office2 and back
1.1. if packets fly back and forth, then from office2 it will connect using telnet to the port that you forwarded for rdp
1.2. If telnet couldn't connect, go to the router and look at the settings, maybe there is some kind of blacklist where the address of office2
1.3 got to; in office1 and in office2 the firewall is disabled on the router (for the duration of the test)
1.4 if the firewall is disabled, but the last hop should be your host, and it does not send a response, then for some reason the router drops packets, here you already need to know what kind of hardware / software routes traffic
1.5. if you do not see the penultimate hop (office2 gateway) in the route, then there is a problem with routes

Answer 2

If the provider is Dom.ru, then it may still be a problem for them. These krivoruchki closed the ports for samba to me, supposedly so that viruses would not write anything to me in the ball. Moreover, they closed it in the opposite direction, on outgoing, and not on incoming, it didn’t work out to convince them to do it right, a very oak supporter was caught