CAS role 2010 SP1 already installed was running fine until I installed a couple of Windows updates. Upon reboot the ms exch Active Directory Topology service fails to start. I've since uninstalled the updates but still the service won't start. Since this a CAS role i don't have any mail security AV/Spam software installed on it. Symantec endpoint protection is installed but is now disabled. A post on this forum had similiar issues w/Symantec mail security gateway but again its not installed. A few other posts described running into these errors but that was due to either an upgrade or install of exchange. Again this was running fine until reboot after windows updates. One KB article sugests stopping and restarting the "Remote Procedure Call (RPC)" service but the options to do so are grey out. Manually starting the sevice results in the same error logs below plus a small popup that states: "Windows could not start the MS Exchange Active Directory topology on excas01. For more info, review the system event log. If this is a non-MS service, contact the service vendor, and refer to service-specific error code -2147024809 Ive tried to set the service w/a delay start, then tried w/manual but still no go. Upon examination of the app logs the service starts as evidenced by the following events: FIRST: Log Name: Application Source: MSExchange ADAccess Date: 2/4/2011 1:47:43 PM Event ID: 2068 Task Category: General Level: Information Keywords: Classic User: N/A Computer: EXCAS01 Description: Process MSEXCHANGEADTOPOLOGYSERVICE.EXE (PID=4624). DSAccess initialized successfully. Event Xml: <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"> <System> <Provider Name="MSExchange ADAccess" /> <EventID Qualifiers="16388">2068</EventID> <Level>4</Level> <Task>1</Task> <Keywords>0x80000000000000</Keywords> <TimeCreated SystemTime="2011-02-04T21:47:43.000000000Z" /> <EventRecordID>10533</EventRecordID> <Channel>Application</Channel> <Computer>EXCAS01</Computer> <Security /> </System> <EventData> <Data>MSEXCHANGEADTOPOLOGYSERVICE.EXE</Data> <Data>4624</Data> </EventData> </Event> SECOND: Log Name: Application Source: MSExchange ADAccess Date: 2/4/2011 1:47:43 PM Event ID: 2081 Task Category: Topology Level: Information Keywords: Classic User: N/A Computer: EXCAS01 Description: Process MSEXCHANGEADTOPOLOGYSERVICE.EXE (PID=4624). Exchange Active Directory Provider will use the servers from the following list: Domain Controllers: dc3 dc1 DC01 Global Catalogs: dc3 dc1 The Configuration Domain Controller is set to DC01 Event Xml: <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"> <System> <Provider Name="MSExchange ADAccess" /> <EventID Qualifiers="16388">2081</EventID> <Level>4</Level> <Task>3</Task> <Keywords>0x80000000000000</Keywords> <TimeCreated SystemTime="2011-02-04T21:47:43.000000000Z" /> <EventRecordID>10534</EventRecordID> <Channel>Application</Channel> <Computer>EXCAS01</Computer> <Security /> </System> <EventData> <Data>MSEXCHANGEADTOPOLOGYSERVICE.EXE</Data> <Data>4624</Data> <Data>dc3 dc1 DC01 </Data> <Data>dc3 dc1 </Data> <Data>DC01</Data> </EventData> </Event> THIRD: Log Name: Application Source: MSExchange ADAccess Date: 2/4/2011 2:04:13 PM Event ID: 2080 Task Category: Topology Level: Information Keywords: Classic User: N/A Computer: EXCAS01 Description: Process MSEXCHANGEADTOPOLOGYSERVICE.EXE (PID=1376). Exchange Active Directory Provider has discovered the following servers with the following characteristics: (Server name | Roles | Enabled | Reachability | Synchronized | GC capable | PDC | SACL right | Critical Data | Netlogon | OS Version) In-site: dc3 CDG 1 7 7 1 0 1 1 7 1 dc1 CDG 1 7 7 1 0 1 1 7 1 DC01 CDG 1 7 7 1 0 1 1 7 1 Out-of-site: seadc3 CDG 1 7 7 1 0 1 1 7 1 Event Xml: <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"> <System> <Provider Name="MSExchange ADAccess" /> <EventID Qualifiers="16388">2080</EventID> <Level>4</Level> <Task>3</Task> <Keywords>0x80000000000000</Keywords> <TimeCreated SystemTime="2011-02-04T22:04:13.000000000Z" /> <EventRecordID>10574</EventRecordID> <Channel>Application</Channel> <Computer>EXCAS01</Computer> <Security /> </System> <EventData> <Data>MSEXCHANGEADTOPOLOGYSERVICE.EXE</Data> <Data>1376</Data> <Data>dc3 CDG 1 7 7 1 0 1 1 7 1 dc1 CDG 1 7 7 1 0 1 1 7 1 DC01 CDG 1 7 7 1 0 1 1 7 1 </Data> <Data>seadc3 CDG 1 7 7 1 0 1 1 7 1 </Data> </EventData> </Event> LAST but not least....: Log Name: Application Source: MSExchange ADAccess Date: 2/4/2011 2:04:15 PM Event ID: 2600 Task Category: General Level: Error Keywords: Classic User: N/A Computer: EXCAS01 Description: Process MSEXCHANGEADTOPOLOGY (PID=1376). DSAccess could not initiate a remote procedure call (RPC) - Call=RegisterRPCProtseqsAndAuth Error code=80070057. Event Xml: <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"> <System> <Provider Name="MSExchange ADAccess" /> <EventID Qualifiers="49156">2600</EventID> <Level>2</Level> <Task>1</Task> <Keywords>0x80000000000000</Keywords> <TimeCreated SystemTime="2011-02-04T22:04:15.000000000Z" /> <EventRecordID>10575</EventRecordID> <Channel>Application</Channel> <Computer>EXCAS01</Computer> <Security /> </System> <EventData> <Data>MSEXCHANGEADTOPOLOGY</Data> <Data>1376</Data> <Data>RegisterRPCProtseqsAndAuth</Data> <Data>80070057</Data> </EventData> </Event> Any ideas would be greatly appreciated. thanks!

Hello Make sure that you have local administrator rights on Exchange server. Run the Dcdiag and post the results. Thanks Mhussain

Can you check the registry for the following key: HKEY_LOCAL_MACHINE\Software\Microsoft\Rpc\Internet If you have it, can you back up that key, delete it, then reboot your server?Tim Harrington | MVP: Exchange | MCITP: EMA 2007/2010, MCITP: Server 2008, MCTS: OCS | Blog: http://HowDoUC.blogspot.com | Twitter: @twharrington

Please try the suggestion from Tim, the symptom can appear if the related registry isn’t correct James Luo TechNet Subscriber Support in forum If you have any feedback on our support, please contact tngfb@microsoft.com Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.

Waiting for the update... It should work..Gulab | MCTS-MCITP: 2007 | MCTS-MCITP: 2010 | Skype: gulab.mallah

WooHoo! that was it! Services are up. Thanks So why would this cause a prob? Tim or James can either one of you elaborate? Can you check the registry for the following key: HKEY_LOCAL_MACHINE\Software\Microsoft\Rpc\Internet If you have it, can you back up that key, delete it, then reboot your server? Tim Harrington | MVP: Exchange | MCITP: EMA 2007/2010, MCITP: Server 2008, MCTS: OCS | Blog: http://HowDoUC.blogspot.com | Twitter: @twharrington