MsExchange Blog Spot Telnet25

September 5, 2009

Process MSEXCHANGEADTOPOLOGYSERVICE.EXE (PID=916). Topology discovery failed, error SBS 2008

Filed under: General — telnet25 @ 12:17 am

Problem: Exchange information store and SA is not coming up, event logs are showing topology errors, Event ID: 2114

Log Name:      Application
Source:        MSExchange ADAccess
Date:          9/4/2009 3:39:41 PM
Event ID:      2114
Task Category: Topology
Level:         Error
Keywords:      Classic
User:          N/A
Process MSEXCHANGEADTOPOLOGYSERVICE.EXE (PID=916). 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.

Cause :

Disabling IPV6 on the TCP/IP properties of the NIC Card will create this problem on SBS 2008 installation



Enable IPV6 on the NIC Interface



Issues After Disabling IPv6 on Your NIC on SBS 2008
Properly Disabling IPv6

SBS 2008 is designed to fully support IPv6 and has IPv6 enabled by default.  Most users should never need to disable IPv6, however if you must disable IPv6 here is how to disable it properly:

Important: This section, method, or task contains steps that tell you how to modify the registry. However, serious problems might occur if you modify the registry incorrectly. Therefore, make sure that you follow these steps carefully. For added protection, back up the registry before you modify it. Then, you can restore the registry if a problem occurs. For more information about how to back up and restore the registry, click the following article number to view the article in the Microsoft Knowledge Base: 322756 (


  • Uncheck Internet Protocol Version 6 (TCP/IPv6) on your Network Card. 
    In Registry Editor, locate and then click the following registry subkey:HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\Tcpip6\Parameters\
    Double-click DisabledComponents to modify the DisabledComponents entry.
    Note If the DisabledComponents entry is unavailable, you must create it. To do this, follow these steps:
    In the Edit menu, point to New, and then click DWORD (32-bit) Value.
    Type DisabledComponents, and then press ENTER.
    Double-click DisabledComponents.
    Enter "ffffffff" (eight f’s), and then click OK:


  • Reboot the SBS 2008 server


oz Casey Dedeal,

MVP (Exchange)
MCSE 2003, M+, S+, MCDST
Security+, Project +, Server +

Http:// (Blog)

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