Active Directory Error

Hi,

I’m Facing one problem..

I’m having two Win2k3 Ent Server. One is a DC and second one i have creat as a ADC. Now the problem is when i shutdown my Dc i expect my ADC should act as a DC. So after shutting down my DC, if i try to open the Active Directory it prompet an error message box i.e. “Naming information cannot be located because : The specified domain either does not exist or could not be contacted. Contact your system administrator to verify that your domain is properly configured and is currently online.”

Please guide me to solve this problem. Actualy i wish to make a setup of MSExchange which i have almost complited.. Please help…