Let me explain the issue.....
We were using two server let us say server 'A'(Parent) and server 'B'(Child). All the users of parent server 'A' was their in Child user 'B' and it was working fine. Due to some prob, I format the Parent Server 'A' and created the users in server 'A' which are there in child server 'B', now the end users are able to login in the server 'A'. But, Server 'B' is not accessible.
Please let me know the solution to recreate the server 'B' as a child with respect to the parent server 'A' as it was there before formatting the server 'A'.
Please let me know, if you are in need of any information.