Adding Clients to the groups

Hi 

Please can anyone guide me through :

We have SEPM 12 in my production environment.

with all clients on win7 . 

I have recently deployed a test server with SEPM 14 for testing purposes. 

I am unable to intergrate the active directory , when i am adding the server to add Directory Server comes up with a warning : Unknown AD Connection Error.

which means i am unable to add OU to the groups. 

Please can some one help me with this ?

On the other hand when i try to add specific clients via IP address it does creates a connection to deploy client remotely once the status is comes up with successful it doesnt seems to appear in its desired group. 

Am i missing a trick here do i need to unistall the previously installed client on win 7 machines or is it something else to it , bcz when i try to push remotely from the server the message of deployment seems to appear on the client.

Please can anyone guide me through . 

Thanks