How to allow a local user to connect via RDP to Win 2003 Server?

Question

Windows Server

Help a novice system administrator :) I will describe the situation:
Once upon a time there was a domain network, it had a domain controller and several servers included in the domain (all machines on win 2003 server). There was a need to withdraw one server (SRV1) from the old domain and connect (not enter) to the new network, in which the domain controller is running on Win 2012 Server.
So, I removed the old server (SRV1) from the old domain, logged in under the admin account, manually assigned network settings (gateway, dns) to it and connected it to the new network. I'm trying to connect to it from a client machine via RDP named SRV1 and connect! I enter the admin username / password and successfully go to it. Everything is ok here. But I need to have the ability for several users to connect to this server under their own accounts.
I created their local accounts on the server, on the server itself I successfully log in under them, but when I try to log in via RDP, the response is "To log in to this remote computer, you need to have permission to log in through the terminal service.... blah blah." Moreover, the operation "Local Policies -> User Rights Assignment -> Allow logon through Remote Desktop Service" I successfully did, but it did not fix the situation.
Tell me how to be? I won't enter it into the domain on Win 2012, will I? Yes, and I don't need it. It is necessary for me that sometimes 3 users on RDP worked on this machine. That's all, nothing more is required of her.

Answer 1

You need to add them to the "Remote Desktop Users" group on the server.

Answer 2

Andrew, thanks, I'll try to do it tomorrow.
Artem, I understood that the server was no longer in the domain and connected with local accounts :)