2008 Enterprise R2 : Image restore issue on domain contoller : LDP, DNS, NETLOGIN failed : failed test DNS

Question

Dear All,
I need your help in order to resolve issue i got. I have domain controller, and additional domain controller in production and both were working fine untill i restore image on 'Domain Controller' and after that i was not able to browse 'AD'. I checked and
came to know that NETLOGIN service was PAUSED. i fixed that issue but when i went to Additional Domain, that machine was not able to find Dmain. i realise that DNS/LDAP is not working. I run the command "DCDIAG /TEST:DNS" just to check the connetivy,
and found DNS connectivity sissue on Main Domain controller. Please help me with the issue. 
Window Server 2008
Domain Main :   GTMAIN : 192.168.0.1
Additional Domain Controller :   GTMAIN2 : 192.168.0.2
Microsoft Windows [Version 6.1.7601]
Copyright (c) 2009 Microsoft Corporation.  All rights reserved.
C:\Users\Administrator> DCDIAG /TEST:DNS
Directory Server Diagnosis
Performing initial setup:
   Trying to find home server...
   Home Server = GTMain
   * Identified AD Forest.
   Done gathering initial info.
Doing initial required tests
   Testing server: Default-First-Site-Name\GTMAIN
      Starting test: Connectivity
         Although the Guid DNS name
         (0d76309b-aebd-4f7e-b024-d0c3f380c1b1._msdcs.goldteam.co.uk) resolved
         to the IP address (87.82.208.116), which could not be pinged, the
         server name (GTMain.goldteam.co.uk) resolved to the IP address
         (fe80::5efe:192.168.1.1%12) and could be pinged.  Check that the IP
         address is registered correctly with the DNS server.
         Got error while checking LDAP and RPC connectivity. Please check your
         firewall settings.
         ......................... GTMAIN failed test Connectivity
Doing primary tests
   Testing server: Default-First-Site-Name\GTMAIN
      Starting test: DNS
         DNS Tests are running and not hung. Please wait a few minutes...
         ......................... GTMAIN 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 : goldteam
   Running enterprise tests on : goldteam.co.uk
      Starting test: DNS
         Test results for domain controllers:
            DC: GTMain.goldteam.co.uk
            Domain: goldteam.co.uk
               TEST: Basic (Basc)
                  Error: No LDAP connectivity
                  Warning: adapter
                  [00000014] Broadcom BCM5708C NetXtreme II GigE (NDIS VBD Clien
t)
                  has invalid DNS server: 192.168.0.100 (<name unavailable>)
                  Warning: adapter
                  [00000014] Broadcom BCM5708C NetXtreme II GigE (NDIS VBD Clien
t)
                  has invalid DNS server: 212.135.1.36 (<name unavailable>)
                  Error: all DNS servers are invalid
                  No host records (A or AAAA) were found for this DC
               TEST: Dynamic update (Dyn)
                  Warning: Failed to add the test record dcdiag-test-record in z
one goldteam.co.uk
            TEST: Records registration (RReg)
               Error: Record registrations cannot be found for all the network
               adapters
         Summary of test results for DNS servers used by the above domain
         controllers:
            DNS server: 192.168.0.100 (<name unavailable>)
               2 test failure on this DNS server
               PTR record query for the 1.0.0.127.in-addr.arpa. failed on the DN
S server 192.168.0.100               Name resolution is not functional. _ldap._t
cp.goldteam.co.uk. failed on the DNS server 192.168.0.100
            DNS server: 212.135.1.36 (<name unavailable>)
               2 test failure on this DNS server
               Name resolution is not functional. _ldap._tcp.goldteam.co.uk. fai
led on the DNS server 212.135.1.36
         Summary of DNS test results:
                                            Auth Basc Forw Del  Dyn  RReg Ext
            Domain: goldteam.co.uk
               GTMain                       PASS FAIL PASS PASS WARN FAIL n/a
         ......................... goldteam.co.uk failed test DNS
C:\Users\Administrator>

Answer 1

Thanks for the response.
DC1 :Main Domain Contoller: Issue @ momemnt because of restore. seems to me DNS is working/responoding
along wiht RPC but i can see that DNS service is started? 
DC2 :Additional Domain Contoller: Healthy but i am not able to login on AD on that server becuase of
below mentioned issue
Naming information cannot be located becuase: the target principle name is incorrect
I am confused that if i downgrade the DC1,
how about if i am not able to recove AD?
which process should i adopt?
Thanks