DNS server not working

I have a Win 2008 R2 server running AD, DHCP and DNS, all of which worked fine when I first set it all up (it's for a new client and they haven't started up the business yet so the server is just sitting in my office where I'm setting it up).
Now however, the DNS doesn't work on the client PC's.

When I run the best practice analyser on the DNS role I get several errors including;
The DNS server 192.168.1.149 on Local Area Connection did not successfully resolve the name _ldap._tcp.gc._msdcs.domain.local.
The DNS server 192.168.1.149 on Local Area Connection did not successfully resolve the name of the address (A) record for this computer.
There's several more, all similar, referring to kerboses recource record, LDAP resource records etc.

There's no reference to any issue in the DNS logs.
The Server itself can connect to the Internet fine, but the clients can't, even though they can connect to the server for domain access and DHCP.

Here's the output from ipconfig /all on the server. Sorry it's long - I included everything in case it's relevant but Ethernet adapter Local Area Connection is the only one I think is relevant (Local Area Connection 3 is Open VPN, and Local Area Connection 2 is the other NIC)

Windows IP Configuration

   Host Name . . . . . . . . . . . . : Server01
   Primary Dns Suffix  . . . . . . . : domain.local
   Node Type . . . . . . . . . . . . : Hybrid
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No
   DNS Suffix Search List. . . . . . : domain.local

Ethernet adapter Local Area Connection 3:

   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : TAP-Win32 Adapter V9
   Physical Address. . . . . . . . . : 00-FF-F8-D6-71-7E
   DHCP Enabled. . . . . . . . . . . : Yes
   Autoconfiguration Enabled . . . . : Yes
   Link-local IPv6 Address . . . . . : fe80::3c65:e003:3450:5a71%16(Preferred)
   IPv4 Address. . . . . . . . . . . : 10.8.0.1(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.252
   Lease Obtained. . . . . . . . . . : 10 May 2013 11:48:54
   Lease Expires . . . . . . . . . . : 10 May 2014 11:48:53
   Default Gateway . . . . . . . . . :
   DHCP Server . . . . . . . . . . . : 10.8.0.2
   DHCPv6 IAID . . . . . . . . . . . : 385941496
   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-18-B8-4B-8A-00-19-99-F5-47-21

   DNS Servers . . . . . . . . . . . : fec0:0:0:ffff::1%1
                                       fec0:0:0:ffff::2%1
                                       fec0:0:0:ffff::3%1
   NetBIOS over Tcpip. . . . . . . . : Enabled

Ethernet adapter Local Area Connection 2:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Intel(R) 82574L Gigabit Network Connectio
n
   Physical Address. . . . . . . . . : 00-19-99-ED-26-EF
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

Ethernet adapter Local Area Connection:

   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Intel(R) 82579LM Gigabit Network Connecti
on
   Physical Address. . . . . . . . . : 00-19-99-F5-47-21
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   Link-local IPv6 Address . . . . . : fe80::1c69:ef21:87e7:eb9a%11(Preferred)
   IPv4 Address. . . . . . . . . . . : 192.168.1.149(Preferred)
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 192.168.1.254
   DHCPv6 IAID . . . . . . . . . . . : 234887577
   DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-18-B8-4B-8A-00-19-99-F5-47-21

   DNS Servers . . . . . . . . . . . : ::1
                                       192.168.1.149
                                       127.0.0.1
   NetBIOS over Tcpip. . . . . . . . : Enabled

Tunnel adapter isatap.{5764B63B-78F5-41A8-8FF0-3E85876AF0E5}:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Microsoft ISATAP Adapter
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.{36F243C5-92E0-4F7E-A11C-FE7E1376FB5B}:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Microsoft ISATAP Adapter #2
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

Tunnel adapter Local Area Connection* 12:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Teredo Tunneling Pseudo-Interface
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

Tunnel adapter isatap.{F8D6717E-AF5D-4260-A5EC-75B171EC26FD}:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . :
   Description . . . . . . . . . . . : Microsoft ISATAP Adapter #3
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
ThatsTheWayWeGetByAsked:
Who is Participating?
 
ThatsTheWayWeGetByConnect With a Mentor Author Commented:
Thanks for your replies and attempts to help.

Jai, Local Area connection 3 you're referring to in your answer is actually a VPN, not a real card.

Anyway, I have got the issue sorted now, although I'm not even sure I fully understand what the issue was or how to explain what it was - in a nutshell it was actually a DHCP issue as the router and server were both doing DHCP. I disabled DHCP on the server and all is working fine now.

(All the errors thrown up by the DNS best practise analyser were taken care of with an exception)
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SStoryCommented:
I can only say one thing. Be sure it isn't something to do with IPv6 messing you up.  If you stuff all relies on IPv4--still--your clients might be doing IPv6 DNS requests for AAAA and not getting anywhere.
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mrcannonCommented:
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JaihuntCommented:
Hi

Why Two Network cards enabled in the machines ? One is DHCP enabled(Local Area Connection3) and one is Static IP address(Local Area Connection) In dhcp enabled DNS servers are assigned as IPV6 address and in static IP DNS address pointing to ::1 IPV6 Loop back address. That's why  DNS is not resolving properly. If you are using static IP point it to DNS servers and remove the IPV6. If you are using DHCP check why the DNS servers not configured properly or disable the network card.

Thanks
Jai
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ThatsTheWayWeGetByAuthor Commented:
The other posters would have had no way of know, but the actual problem turned out to be DHCP, not DNS
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