Win XP Pro pcs drop domain

We have a network with a Windows 2008 R2 Std domain controller/DNS/file server and a mixture of Windows XP Pro, Windows Vista Business and Windows 7 Professional PCs.

Since I enabled automatic scavenging of stale records on the domain server I've had 3 Windows XP Pro machines fall off the domain.
The first one went back onto the domain ok (put it back into workgroup, removed it's record from active directory and then put it back on the domain again).
But I've had a second one go off now and it won't go back on.  When trying I got the following error message;

The domain name mydomain might be a NetBIOS domain name.  If this is the case, verify that the domain name is properly registered with WINS.

If you are certain that the name is not a NetBIOS domain name, then the following information can help you troubleshoot your DNS configuration.

The following error occurred when DNS was queried for the service location (SRV) resource record used to locate a domain controller for domain mydomain:

The error was: "DNS name does not exist."
(error code 0x0000232B RCODE_NAME_ERROR)

The query was for the SRV record for _ldap._tcp.dc._msdcs.mydomain

Common causes of this error include the following:

- The DNS SRV record is not registered in DNS.

- One or more of the following zones do not include delegation to its child zone:

mydomain
. (the root zone)

For information about correcting this problem, click Help.

So Ok, I went to the server and did the following;

C:\>dcdiag /test:dns /s:rs1 /DnsBasic

Directory Server Diagnosis

Performing initial setup:
   * Identified AD Forest.
   Done gathering initial info.

Doing initial required tests

   Testing server: Default-First-Site-Name\RS1
      Starting test: Connectivity
         The host 9c3901b2-ecc4-4bb4-ba41-0a67dcd8b932._msdcs.mydomain.co.uk
         could not be resolved to an IP address. Check the DNS server, DHCP,
         server name, etc.
         Got error while checking LDAP and RPC connectivity. Please check your
         firewall settings.
         ......................... RS1 failed test Connectivity

Doing primary tests

   Testing server: Default-First-Site-Name\RS1

      Starting test: DNS

         DNS Tests are running and not hung. Please wait a few minutes...
         ......................... RS1 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 : mydomain

   Running enterprise tests on : mydomain.co.uk
      Starting test: DNS
         Test results for domain controllers:

            DC: RS1.mydomain.co.uk
            Domain: mydomain.co.uk


               TEST: Basic (Basc)
                  Error: No LDAP connectivity
                  No host records (A or AAAA) were found for this DC

         Summary of DNS test results:

                                            Auth Basc Forw Del  Dyn  RReg Ext
            _________________________________________________________________
            Domain: mydomain.co.uk
               RS1                          PASS FAIL n/a  n/a  n/a  n/a  n/a

         ......................... mydomain.co.uk failed test DNS

C:\>

I sense something is very broken here ;-)  Could anyone help me with this please?
sjb79Asked:
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Darius GhassemCommented:
If you look on the record itself I would remove the option for SRV records to be scavenaged.

http://blogs.technet.com/b/networking/archive/2008/03/19/don-t-be-afraid-of-dns-scavenging-just-be-patient.aspx

Second make sure all cleints and servers are only pointing to internal DNS servers. Seems like they are not updating since DNS scavenaging is removing records without an update record
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Darius GhassemCommented:
Seems like scavenaging is removing the records before they can be updated. I would go to the records properties here you can change the settings for scavenaging on  your SRV records and for your DC.
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sjb79Author Commented:
Hello,
If I understand it correctly this is set to do so every 7 days...?

 Screen shot of Scavenging period
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sjb79Author Commented:
I turned scavenging off as I could not find that particular option you refered to and the Widows XP machines are happy again.  I will read that article and act on it as I would like to use scavenging.  I'll mark this up as solved though.  Many thanks.
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