DHCP clients cannot see the domain (Windows 2008), DNS problem?

Hi everyone,

Help urgently needed - my phone keeps calling and I have no idea what to do next!


Something went wrong with our DNS server (Windows 2008 SP2).
DHCP clients can no longer login (domain is unavailable), workstations with static IPs work fine.

Here's output from dc1 (DC + DNS + DHCP server) ipconfig /all and dcdiag /testdns.
Looks like something is wrong with the DNS, I don't know how to fix it :(

Windows IP Configuration

   Host Name . . . . . . . . . . . . : DC1
   Primary Dns Suffix  . . . . . . . : company.local
   Node Type . . . . . . . . . . . . : Hybrid
   IP Routing Enabled. . . . . . . . : No
   WINS Proxy Enabled. . . . . . . . : No
   DNS Suffix Search List. . . . . . : company.local

Ethernet adapter Local Area Connection:

   Connection-specific DNS Suffix  . : 
   Description . . . . . . . . . . . : Intel(R) PRO/1000 MT Network Connection
   Physical Address. . . . . . . . . : 00-50-56-88-7B-96
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes
   IPv4 Address. . . . . . . . . . . : 192.168.0.6(Preferred) 
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 192.168.0.10
   DNS Servers . . . . . . . . . . . : 192.168.0.6
                                       127.0.0.1
   NetBIOS over Tcpip. . . . . . . . : Enabled

Tunnel adapter Local Area Connection* 8:

   Media State . . . . . . . . . . . : Media disconnected
   Connection-specific DNS Suffix  . : 
   Description . . . . . . . . . . . : isatap.{159AEBB9-5CD0-4940-BAA7-21E3F828C1EE}
   Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
   DHCP Enabled. . . . . . . . . . . : No
   Autoconfiguration Enabled . . . . : Yes

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Directory Server Diagnosis


Performing initial setup:

   Trying to find home server...

   Home Server = DC1

   * Identified AD Forest. 
   Done gathering initial info.


Doing initial required tests

   
   Testing server: Default-First-Site-Name\DC1

      Starting test: Connectivity

         ......................... DC1 passed test Connectivity



Doing primary tests

   
   Testing server: Default-First-Site-Name\DC1

   
      Starting test: DNS

         

         DNS Tests are running and not hung. Please wait a few minutes...

         ......................... DC1 passed test DNS

   
   Running partition tests on : ForestDnsZones

   
   Running partition tests on : DomainDnsZones

   
   Running partition tests on : Schema

   
   Running partition tests on : Configuration

   
   Running partition tests on : company

   
   Running enterprise tests on : company.local

      Starting test: DNS

         Test results for domain controllers:

            
            DC: DC1.company.local

            Domain: company.local
            
             
               TEST: Basic (Basc)
                  Warning: The AAAA record for this DC was not found
                  
               TEST: Delegations (Del)
                  Error: DNS server: dc1.company.com. IP:<Unavailable>

                  [Missing glue A record]

                  
               TEST: Records registration (RReg)
                  Network Adapter

                  [00000006] Intel(R) PRO/1000 MT Network Connection:

                     Warning: 
                     Missing AAAA record at DNS server 192.168.0.6: 
                     DC1.company.local
                     
                     Warning: 
                     Missing AAAA record at DNS server 192.168.0.6: 
                     gc._msdcs.company.local
                     
                     Warning: 
                     Missing AAAA record at DNS server 192.168.0.6: 
                     DC1.company.local
                     
                     Warning: 
                     Missing AAAA record at DNS server 192.168.0.6: 
                     gc._msdcs.company.local
                     
               Warning: Record Registrations not found in some network adapters

         
         Summary of DNS test results:

         
                                            Auth Basc Forw Del  Dyn  RReg Ext
            _________________________________________________________________
            Domain: company.local

               DC1                          PASS WARN PASS FAIL PASS WARN n/a  
         
         ......................... company.local failed test DNS

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Thanks a lot, you are saving the day!
DNS-screenshot-1.jpg
itoranaAsked:
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Adam BrownSr Solutions ArchitectCommented:
You'll need to look at your DHCP clients to get the right guidance. Go to a computer that isn't connecting properly and run ipconfig/all on it, then post that.

It's possible that your DHCP clients aren't being assigned a valid DNS server to use. The only way to determine that is to see what the clients are getting for IP addresses. We can't really tell anything from looking at the server's IP Configuration.
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Skyler KincaidNetwork/Systems EngineerCommented:
It looks like your DNS server is having issues or your DC is unable to connect to it. If you open the DNS management console do you see entries for your DC? Can you verify that the DNS Server service is running?
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itoranaAuthor Commented:
I don't know why but the error disappeared by itself the next day.
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