How to access a shared network drive?

Question

Domain Name System

Part of the organization has moved to a new office with one power outlet. Before the move, users had a connection to a shared drive + the Internet through a proxy. There is also a domain. (Forgive me for such explanations.) It would seem that solving the problem is simple: put a switch, plugged it into a network outlet and, in theory, it should work. But it was not there. The computers ping each other, but only one of the 7 has access to a shared disk with the Internet. (It looks like the one that turns on first)
The rest do not see either the shared disk, or the domain, or the proxy. On SOME, the error "The name of the local device is already in use" pops up. Everyone has the same masks, ip in the same network.

Answer 1

Few data.
In addition to the move, there are apparently some other changes in the network. VLANs, for example?
Have you added any clients? Duplicate addresses, names?
7 respond among themselves, or with the server where a sphere too? In a segment behind a switch?
Can all 7 reach the gateway, fileserver, proxy by IP?
In general, a classic of troubleshooting. Connectivity first, then access and everything else.
We draw a network diagram, think, ping, scan, check settings everywhere, duplicate names, addresses, etc.