Added existing domain to the parent domain and now permission not inheriting on the child domain

Question

Hi Friends
There was a existing Domain but we bought the company and make that Domain as a child domain of our Domain, problem is that users of Parent domain does not have access to the child domain. permissions are not inheriting from parent domain to child domain. 
for e.g i created user on the parent domain i cant even login to the machine in other domain or access the resources which are on the child domain.

Answer 1

Simply delegate the permissions you want to grant so that users from the root domain can have access to resources in the child domain.
As an example, you make users from the parent domain login to computers from the child domain using
Allow logon locally group policy: http://technet.microsoft.com/en-us/library/cc756809%28v=ws.10%29.aspx
You can also make them able to RDP the computers if you add them to Remote Desktop Users
group. This could be done by Restricted Groups Group Policy.
So, for security reasons and depending on your current configuration, it is normal that users from the root domain might not have by default access to resources in the child domain. This could be fixed by doing the proper delegation.
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Ahmed MALEK
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