Application login to disconnected child domain Windows 2000 sp4

I have an application that uses Windows 2000 domain user accounts to login. The domain accounts were in a child domain that is no longer connected to the parent domain. And the primary domain controller of the child domain went up in smoke, so the back up dc from the child domain is the only dc for the application to validate it's users, but no users can logon to the application. The application server and the dc are connected to each other through a switch, are on the same subnet and the same domain. they ping each other as well as resolve dns. I am missing something but I don't know what. PLEASE help.
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Check the DNS zone for the child domain and make sure CVIBIF has an A record with the correct IP.  Delete the wrong one.  Update the SOA as far as the IP on which etc.
Did you assert that the remaining DC is now the master using ntdsutil?
Is the application server uses the DNS on this DC or are they using another server for DNS?
RyedogAuthor Commented:
No I hadn't asserted the remaining dc as master.  I just now resurected the primary dc for the child domain but still have the same problem. Both dc's and the application server see each other via ping.
I changed the subnet they are on, put them in a separate vlan and tagged the port (HP) on the core L3 switch to separate from a possible conflicting similar forest/domain.  Still same problem. any ideas ?
Making Bulk Changes to Active Directory

Watch this video to see how easy it is to make mass changes to Active Directory from an external text file without using complicated scripts.

run dcdiag. Check the DNS zone for the domain to make sure that the IP changes propagated within the zone.
What ever your application server is you need to check its pointing to healthy dns server which is available. Because application reach to dc for authentication using srv records in dns & if it doesn't reach to dns only it will not able to locate DC.

When you say you changed IP of dc,have you check new IP change for old ip is reflected in DNS,did you restart dns,netlogon services & ran ipconfig /flushdns & ipconfig /register dns followed by dcdiag /fix

Did you link the new subnet with the site in the AD sites & services.
netdomain query fsmo
dcdiag /v
dcdiag /test:DNS

Check what the report comes out & post.

Have you follow the below link for IP change.
RyedogAuthor Commented:
The following is the netdom and dcdiag /v results. The dcdiag that is loaded would not do /test:dns.
I ran /test:registerindns and the results came back with no problems.

C:\>netdom query fsmo
Schema owner      
Domain role owner 
PDC role          
RID pool manager  
Infrastructure owner
The command completed successfully.

Performing initial setup:
   * Verifying that the local machine cvibif, is a DC.
   * Connecting to directory service on server cvibif.
   * Collecting site info.
   * Identifying all servers.
   * Found 6 DC(s). Testing 1 of them.
   Done gathering initial info.

Doing initial required tests

   Testing server: Default-First-Site-Name\CVIBIF
      Starting test: Connectivity
         * Active Directory LDAP Services Check's server GUID DNS
ame could not be resolved to an
         IP address.  Check the DNS server, DHCP, server name, etc
         Although the Guid DNS name
         ( couldn't be
         resolved, the server name ( resolved to the IP
         address ( and was pingable.  Check that the IP address
         is registered correctly with the DNS server.
         ......................... CVIBIF failed test Connectivity

Doing primary tests

   Testing server: Default-First-Site-Name\CVIBIF
      Skipping all tests, because server CVIBIF is
      not responding to directory service requests
      Test omitted by user request: Topology
      Test omitted by user request: CutoffServers
      Test omitted by user request: OutboundSecureChannels

   Running enterprise tests on :
      Starting test: Intersite
         Skipping site Default-First-Site-Name, this site is outside the scope
         provided by the command line arguments provided.
         ......................... passed test Intersite
      Starting test: FsmoCheck
         GC Name: \\
         Locator Flags: 0xe00001fd
         PDC Name: \\
         Locator Flags: 0xe00001fd
         Time Server Name: \\
         Locator Flags: 0xe00001fd
         Preferred Time Server Name: \\
         Locator Flags: 0xe00001fd
         KDC Name: \\
         Locator Flags: 0xe00001fd
         ......................... passed test FsmoCheck

Thank you for your help with this
In Dcdiag the GUID (58b7734a-db00-4b2e-a8fb-8474deb54b65) of one of the dc is not resolving & you need to create cname in _msdcs folder in dns. Don't look for msdcs folder outside as its my setting used for delegation.

I think the GUID refer to dc cvibif, you need to create a CNAME records in dns, right click in _msdcs folder & create alias name, if its not there.

Also, run ipconfig /flushdns & ipconfig /registerdns
As arnold, said create a host record for your dc & use nslookup to resolve host to ip & vice versa.
I have attached the screenshot where you can see how to find GUID & where to create a cname record.

Run below & attach the file,don't post the file as it will only increase the page,making blind to important results.

dcdiag /v /c /d /e / >c:\dcdiag.txt
RyedogAuthor Commented:
here is the requested dcdiag.txt. dcdiag.txt
The attach test is not complete, post the complete result.

GUID is not reolving for nay dc.'s server GUID DNS name could not be resolved.

Do as i said above create manually for all dc.

There is error server is not responding to directory service requests for all your domain controller this is because, they are not able to register their records in dns. Create the cname & see to it dns passess all the test.


RyedogAuthor Commented:
I did add cvibif to the acres dns as you asked i believe. All dns records show the corect ip as far as i can tell. Is AD corrupt ?
Again run same dcdiag /v /c /d /e / >c:\dcdiag.txt  optput & let see if everything has been ok now.
RyedogAuthor Commented:
I attached a screenshot of the _msdcs in dns. I added the record that is there. do I need to add something else? Sorry if this is a stupid question. I'm not a dns expert.  dns.pdf
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