Open a port to access Yandex, Google and osm maps?

Question

OpenStreetMap

good afternoon. There is a closed virtual server with Wialon Local server software.
We need to open external ports for Yandex.maps, Google maps and osm
. What resources should be pulled to port 80?

Answer 1

Go to the site, see which domains pull resources from. Open access to all A-records of domains.
PS - a set of domains and given A-records can change, so this method is not a fountain. Set up better proxying through, for example, nginx.