IPA integration issue with RHEV

Hi Team, 

I have a machine named manager.rhevdemo.com and I have instlled a virtual machine by the name ad.rhevdemo.com. After that I have done authentication of AD with my manager for the user authentication.

Now I have installed a separate virtual machine wuth RHEL6.2  and installed the IPA server with DNS as mentioned in the reference architecture on the same server where the machine name is ipa.rhdemo.com (with a different domain name). Now when I restarted my IPA virtual machine and issued the command "kinit admin" I receieved an error "kinit: Cannot contact any KDC for realm 'RHDEMO.COM' while getting initial credentials"