Where can SMB go?

Question

Samba

Greetings,
The situation is this, they changed the provider to RTK and access to the network folder was cut off.
Two branches with white IPs in the network of one provider. There are full access rules between networks, RDP, SQL and other software work. The network folder does not open in any way.
Specially turned off the firewall, antiviruses, completely opened network access. Address
like \\xx.xx.yy.zz\Share
Diagnostics shows "The share resource is available, but does not respond to connection attempts" Access to folders does not work from one server to another, or vice versa . What could be the problem? Is your ISP blocking ports?

Answer 1

On the Internet to use the intranet, hmm, for the first time I see such a topology ...

Answer 2

The situation is this, they changed the provider to RTK and access to the network folder was cut off.

In general, providers usually do not filter the output outside (not counting the -not-remembered-by-night-RKN-), but after all these Sing, Mish, Vasya and other things - blocking 135-137 and 445 is standard practice. Not to protect you. And in order to protect FROM you :)
Between two Mikrotiks VPN rises literally at the click of a finger :)

Answer 3

If you need full network access - raise EoIP between two white addresses, and you can drive it into bridges - it will generally come out as if the cable was stuck between your branches. And do not rely on non-blocking provider.