I get the following error when trying to install mailbox servers. I've already enable IPv6 Source: MSExchange ADAccessDate: 11/13/2008 1:47:36 PMEvent ID: 2114Task Category: TopologyLevel: ErrorKeywords: ClassicUser: N/AComputer: GNPLEXCHMB1.goodmannetworks.localDescription:Process MSEXCHANGEADTOPOLOGYSERVICE.EXE (PID=1760). 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.Event Xml:<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"> <System> <Provider Name="MSExchange ADAccess" /> <EventID Qualifiers="49156">2114</EventID> <Level>2</Level> <Task>3</Task> <Keywords>0x80000000000000</Keywords> <TimeCreated SystemTime="2008-11-13T19:47:36.000Z" /> <EventRecordID>1042</EventRecordID> <Channel>Application</Channel> <Computer>GNPLEXCHMB1.goodmannetworks.local</Computer> <Security /> </System> <EventData> <Data>MSEXCHANGEADTOPOLOGYSERVICE.EXE</Data> <Data>1760</Data> <Data>80040a02</Data> <Data>DSC_E_NO_SUITABLE_CDC</Data> </EventData></Event>

Issue description: MBX server cannot be installed Topology discovery failed, error 0x80040a02 (DSC_E_NO_SUITABLE_CDC) Collect info: 1. Which server roles do you have already installed besides problematic MBX server? Whats the topology currently? 2. Is it a standalone MBX server, no other roles on it? 3. Is there any other error in the application log or installation log? 4. The version of exchange you use is 2007 SP1, right? IPv6 is only supported in exchange 2007 SP1 Troubleshooting: 1. Before doing troubleshooting, remove all traces belong to the old installation before we start again. If you cannot remove Exchange 2007 by using Add/Remove Programs, you can use Registry Editor to remove the Exchange entries from the registry a. On the install CD go to the root right click on ExchangeServer.MSI and right click to choose Uninstall b. Stop and disable the Exchange 2007 services c. Use Registry Editor to remove the Exchange registry keys i. Click Start->Run->regedit ii. Expand to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Exchange iii. Right-click Exchange, and then click Delete. Click Yes in the Confirm Key Delete dialog box iv. Repeat steps b and c for each of the keys containing keyword Exchange or MSEXchange under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services d. Remove and reinstall IIS component e. Remove the Exchange 2007 server from Active Directory i. Launch ADSI Editor ii. Expand to Configuration Container->CN=Configuration, DC= Domain_Name ,DC=com->CN=Services ->CN=Microsoft Exchange->CN= Your_Organization_Name->CN=Administrative Groups ->CN= Your_Administrative_Group_Name->CN=Servers iii. Right-click old Exchange 2007 server object, and select Delete iv. Click Yes in every jumped windows that prompts you to confirm the deletion 2. Check if the "Exchange Servers" group has all the Exchange 2007 servers listed, which also needs to be in the "Exchange Install Domain Servers" group 3. Check the permissions on the policy a. Open the Default Domain Controllers Security Settings snap-in on the DC which specified in the event description b. Expand to Local Policies->User Rights Assignments c. In the right pane, double-click Manage auditing and security log, see if both the Exchange Servers group and Administrators are listed 4. Please run Netdiag and DCdiag to check the GC/DC status 5. Did the AD prepare success before? Please try to run prepareschema, preparedomain, preparead again [Procedure]. Then install exchange