When a destination domain controller running Windows Server 2003 with Service Pack 1 (SP1) receives Event ID 2088 in the Directory Service event log, attempts to resolve the globally unique identifier (GUID) in the alias (CNAME) resource record to an IP address for the source domain controller failed. However, the destination domain controller tried other means to resolve the name and succeeded by using either the fully qualified domain name (FQDN) or the NetBIOS name of the source domain controller. Although replication was successful, the Domain Name System (DNS) problem should be diagnosed and resolved.
The following is an example of the event text:
Log Name: Directory ServiceSource: Microsoft-Windows-ActiveDirectory_DomainServiceDate: 3/15/2008 9:20:11 AMEvent ID: 2088Task Category: DS RPC Client Level: WarningKeywords: ClassicUser: ANONYMOUS LOGONComputer: DC3.contoso.comDescription:Active Directory could not use DNS to resolve the IP address of the source domain controller listed below. To maintain the consistency of Security groups, group policy, users and computers and their passwords, Active Directory Domain Services successfully replicated using the NetBIOS or fully qualified computer name of the source domain controller. Invalid DNS configuration may be affecting other essential operations on member computers, domain controllers or application servers in this Active Directory Domain Services forest, including logon authentication or access to network resources. You should immediately resolve this DNS configuration error so that this domain controller can resolve the IP address of the source domain controller using DNS. Alternate server name: DC1 Failing DNS host name: 4a8717eb-8e58-456c-995a-c92e4add7e8e._msdcs.contoso.com NOTE: By default, only up to 10 DNS failures are shown for any given 12 hour period, even if more than 10 failures occur. To log all individual failure events, set the following diagnostics registry value to 1: Registry Path: HKLM\System\CurrentControlSet\Services\NTDS\Diagnostics\22 DS RPC Client User Action: 1) If the source domain controller is no longer functioning or its operating system has been reinstalled with a different computer name or NTDSDSA object GUID, remove the source domain controller's metadata with ntdsutil.exe, using the steps outlined in MSKB article 216498. 2) Confirm that the source domain controller is running Active Directory and is accessible on the network by typing "net view \\<source DC name>" or "ping <source DC name>". 3) Verify that the source domain controller is using a valid DNS server for DNS services, and that the source domain controller's host record and CNAME record are correctly registered, using the DNS Enhanced version of DCDIAG.EXE available on http://www.microsoft.com/dns dcdiag /test:dns 4) Verify that this destination domain controller is using a valid DNS server for DNS services, by running the DNS Enhanced version of DCDIAG.EXE command on the console of the destination domain controller, as follows: dcdiag /test:dns 5) For further analysis of DNS error failures see KB 824449: http://support.microsoft.com/?kbid=824449 Additional Data Error value: 11004 The requested name is valid, but no data of the requested type was found
Failure to resolve the source domain controller name by using the alias (CNAME) resource record in DNS can be due to DNS misconfigurations or delays in DNS data propagation.