How to give access from the domain to a shared folder in the workgroup?

Question

Network administration

Good afternoon.
There are 2 branches. In branch "A" computers are included in the domain. In "B" - a working group with its own file server (2012). Also in "B" there is one computer (XP), which is included in the domain "A". Several users with passwords have been created on the file server. The server sees the domain computer, and can even enter a name and password, but access is still denied.
What checkbox should be put in Windows 2012 so that it allows connection not only from its own WG?

Answer 1

username in what format do you enter?
try executing the command
net use \\WorkGroupWindowsServer2012name\sharename /user:WorkGroupWindowsServer2012name\UserOnServer2012 Password
Then go to the file share
Of course, the specified user must have access to the shared folder