Setup Domain Trust for internal networks fail - Unable to contact domain error

I have a primary domain, we will call it MM and a virtual domain, called MP. The MM domain is all physical and has been running with no issues. the MP domain is new, and is an attempt to split MM into 2, which is MP. I have a server running ESXi and I have 2 domain controllers running Server 2008 R2, MM domain is running Windows Server 2003. I installed the DNS, DHCP, and AD running. MP is running on a separate subnet, .2.1 and MM is running on .1.1. I can ping the MM domain, and MM can ping the MP domain with no problems. DNS entries were made on both sides (setup as Primary, which I think where the problem is) so the netbios names can be interpreted and pinged.

However, when I do the seemingly easy task of setting up the domain trusts using AD, I enter my MP domain into the fields, set it for Trust with a Windows domain, click next and it fails. The message states that the MP domain cannot be contact... But I can ping the domain, so where is the disconnect?
Luis_RomeroAsked:
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MaheshConnect With a Mentor ArchitectCommented:
Are these two domains are different forests ?

Also you need to setup either conditional forwarder or secondary zone of both domains to each other so that they can identify each other and then you can establish trust

Check below post to establish conditional forwarder in 2003 Domain
http://www.itgeared.com/articles/1035-configuring-dns-conditional-forwarding/
http://www.computerperformance.co.uk/w2k3/services/DNS_conditional_forward.htm

If you wish to use zone transfer method, then 1st you need to enable zone transfer on domain.com zone in both domains and allow zone transfer for opposite domain dns server
http://technet.microsoft.com/en-us/library/cc782181(v=ws.10).aspx

Then you need to setup secondary zone of both domains vice versa
http://technet.microsoft.com/en-us/library/cc816885(v=ws.10).aspx

Once you done that check with nslookup query at both side dns servers

1.On your DNS, click Start, and then click Run.
2.In the Open box, type cmd.
3.Type nslookup, and then press ENTER.
4.Type set type=all, and then press ENTER.
5.Type _ldap._tcp.dc._msdcs.Domain_Name where Domain Name is the name of your domain 1st, if resolved successfully then enter opposite domain and check if it is resolving

http://support.microsoft.com/kb/816587

If above Nslookup queries are successful, then you can build trust

Mahesh
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DrDave242Commented:
Also you need to setup either conditional forwarder or secondary zone of both domains to each other so that they can identify each other and then you can establish trust
You can also use stub zones to accomplish this. They're easier to set up than secondaries, since you don't have to configure zone transfers.
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