MSExchange ADAccess Event 2114: Topology discovery failed, error 0x80040a02 DSC_E_NO_SUITABLE_CDC

MSExchange ADAccess Event 2114: Topology discovery failed, error 0x80040a02 DSC_E_NO_SUITABLE_CDC

Article Summary: This article contains information about an error that can occur when discovering the Active Directory topology


During installation of Microsoft Exchange Server, versions 2007 and later, the install may halt,
and the following status message may be given:

Service 'MSExchangeTransport' failed to reach status 'Running' on this server.

Subsequently, the following entry may be written to the Application Event log:

Source: MSExchange ADAccess

Event ID: 2114

Task Category: Topology

Process MSEXCHANGEADTOPOLOGYSERVICE.EXE (PID=1784). Topology discovery failed,
error 0x80040a02 (DSC_E_NO_SUITABLE_CDC). Look up the Lightweight Directory
Access Protocol (LDAP) error code specified in the event description. To do this,
use Microsoft Knowledge Base article 218185, "Microsoft LDAP Error Codes." Use the
information in that article to learn more about the cause and resolution to this
error. Use the Ping or PathPing command-line tools to test network connectivity
to local domain controllers.

Note: This error may also occur after a system maintenance reboot cycle.


Internet Protocol Version 6 (IPV6) has been improperly disabled on the server. It must be either re-enabled
(preferred) or disabled properly via the System Registry Editor (regedit.exe).


Option I - Re-enable IPV6 on the server's active network interface (NIC).

Option II - Fully disable IPV6 using the steps listed in Dell Support Article 644856.

Additional Information:

Exchange Server versions 2007 and later versions need IPv6 in order to run on Windows Server 2008 and later
versions (unless IPv6 is completely disabled ). Many components depend on IPv6 as listed on TechNet.
During development of the Exchange Server, versions 2007 and beyond, Microsoft has never performed testing
or validation with IPV6 disabled, either partially or completely. As such, the organization which disables IPV6 is
considered to be running Exchange in an unvalidated (and therefore, unsupported) manner.

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Article ID: SLN290567

Last Date Modified: 10/20/2014 09:59 AM

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