DNS Issue

Did you get any error message in the event viewer or popup for the DNS server?

Do you have enabled your DNS zone as domain integrated (Active Directory Integrated) ? If so, check if you do not have enabled in Dynamic Updates allow Secure Updates only. Maybe some of your clients are not supporting this way. Change it to Non-secure and Secure. Test if it solved your problem

Regards,
Krzysztof

Also make sure that the clients use this DNS server as their DNS server - otherwise you'll have to wait for it to get the information through replication. If you want clients to udpate their information on the DNS server you can use the command ipconfig / registerdns

Do you use DHCP? If so, check in the scope option 006 if it has added IP address of your DNS server.

Regards,
Krzysztof

im getting below warning in the DNS eventlog.


Event Type:      Warning
Event Source:      DNS
Event Category:      None
Event ID:      4013
Date:            12/2/2010
Time:            12:06:04 PM
User:            N/A
Computer:      DC.AAA.COM
Description:
The DNS server is waiting for Active Directory Domain Services (AD DS) to signal that the initial synchronization of the directory has been completed. The DNS server service cannot start until the initial synchronization is complete because critical DNS data might not yet be replicated onto this domain controller. If events in the AD DS event log indicate that there is a problem with DNS name resolution, consider adding the IP address of another DNS server for this domain to the DNS server list in the Internet Protocol properties of this computer. This event will be logged every two minutes until AD DS has signaled that the initial synchronization has successfully completed.

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.


Note: DHCP server is located in different vlan. in the scope option also the DNS server ip given correctly.

Are both DNS and DC are in same domain? Are you able to ping both servers from each other?

A few suggestions for AD server holding Global Catalog FSMO role:
1. Check the network control panel / TCP/IP v4 properties and make sure that the server's localhost address is entered instead of the server's local IP address.  ie: 127.0.0.1 instead of 192.168.1.10.
2. Try  to add a host file entry to the new 2008R2 server to reference ITSELF.  in C:\windows\system32\drivers\etc\hosts enter 192.168.1.10  <SERVERNAME> <servername.fqdn.tld> so for a server named server1 in a domain called doman.local with an ip address of 192.168.200.1 I added a line to the hosts file: 192.168.200.1  server1 server1.domain.local.  
3. If you have another Active Directory server (domain controller) with DNS installed, add that server's IP Address as the secondary DNS Server address for this server.
4. Disable IPv6.  To do this, add a new RegDWORD (32-bit) - to the following:
HKLM\System\CurrentControlSet\Services\TCPIP6\Parameters\DisabledComponents = ffffffff
In the network control panel for any adapter connected to your LAN,
- Uncheck IP v6 in the Network Control Panel

Reboot & let's see if you have any success or any new events?

Have you tried to restart DNS server service?

Regards,
Krzysztof

Please post dcdiag

This question has been classified as abandoned and is being closed as part of the Cleanup Program. See my comment at the end of the question for more details.