I'm having a hard time installing CAS. This error is logged: Summary: 1 item(s). 0 succeeded, 1 failed. Elapsed time: 00:00:10 Client Access Role Failed Error: Invalid URI: The hostname could not be parsed. Warning: An unexpected error has occurred and debug information is being generated: Invalid URI: The hostname could not be parsed. Elapsed Time: 00:00:10 Along with this: Watson report about to be sent to dw20.exe for process id: 1204, with parameters: E12, c-RTL-AMD64, 08.01.0240.006, ExSetupUI, M.E.Management, M.E.M.S.NewOabVirtualDirectory.PrepareDataObject, System.UriFormatException, 21d, 08.01.0240.005. ErrorReportingEnabled: True Now what's really uncomfortable is this: Log Name: Directory Service Source: Microsoft-Windows-ActiveDirectory_DomainService Date: 6/9/2010 11:12:52 PM Event ID: 1153 Task Category: DS Schema Level: Warning Keywords: Classic User: ANONYMOUS LOGON Computer: dc1.newasterisk.com Description: Internal event: The following schema class has a superclass that is not valid. Class identifier: 752255911 Class name: msExchOWAVirtualDirectory Superclass identifier: 752255884 Inheritance was ignored. Event Xml: <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event"> <System> <Provider Name="Microsoft-Windows-ActiveDirectory_DomainService" Guid="{0e8478c5-3605-4e8c-8497-1e730c959516}" EventSourceName="NTDS General" /> <EventID Qualifiers="32768">1153</EventID> <Version>0</Version> <Level>3</Level> <Task>24</Task> <Opcode>0</Opcode> <Keywords>0x8080000000000000</Keywords> <TimeCreated SystemTime="2010-06-10T03:12:52.585243100Z" /> <EventRecordID>188</EventRecordID> <Correlation /> <Execution ProcessID="596" ThreadID="2200" /> <Channel>Directory Service</Channel> <Computer>dc1.newasterisk.com</Computer> <Security UserID="S-1-5-7" /> </System> <EventData> <Data>752255911</Data> <Data>msExchOWAVirtualDirectory</Data> <Data>752255884</Data> </EventData> </Event> Now, I know that in AdsiEdit I should see MSExchHomeServer set in user objects, however, these say <not set>. I really don't know where to go from here.

Hi, First I'd like to know some background of the issue. 1. How many Exchange Servers in the network? 2. How many Client Access Server in the network? 3. Please verify if you have NLB configured in the network. Then please try to use the step below to trouble the issue. 1. Please try to create the OAB virtual directory with the appropriate URL manually, specifying the externalurl and -internalurl parameters in the shell. New-OABVirtualDirectory http://technet.microsoft.com/en-us/library/bb123735(EXCHG.80).aspx 2. After that, please re-run the setup. Besides, please ensure that you have properly set the FQDN of the CAS server. Regards, Xiu

Okay, I did remove NLB because I had seen other posts where this allowed the administrator to finish the install. I think I got a little bit further in the process, however, I did get this error message when trying to rerun the install or trying to run new-oabVirtualDirectory: Summary: 2 item(s). 0 succeeded, 1 failed. Elapsed time: 00:00:16 Client Access Role Failed Error: Web object 'IIS://dc1.newasterisk.com/W3SVC/1/ROOT' cannot be found. The service cannot be started, either because it is disabled or because it has no enabled devices associated with it. Elapsed Time: 00:00:16 Mailbox Role Cancelled EDIT: I do know that IIS is running including the W3SVC service.

Also, there are no longer any exchange servers in the network, there was, but he died because of hardware failure, and no CAS.

Hi, First I recommend you to re-install IIS for the Exchange Server. Please use ADSIedit.msc to verify if any exchange server which has died under Server container( Configuration [<domainController>.contoso.com] CN=Configuration,DC=contoso,DC=com CN=Services CN=Microsoft Exchange CN=<OrganizationName> CN=Administrative Groups CN=Exchange Administrative Group (<ID>) CN=Servers). If yes, then please delete it and then re-run the setup again. Regards, Xiu

Yes, of course it was there. You know, I thought to myself, "Hmm... Self, you know you did just install exchange, so of course there would be one there, ah well...." Let me start from scratch.... ...Oh wait I can't, I just blasted it from AD Anyone have any ideas on how I should remove this now to start over before I re-image the server?

Hi, First we need to install Windows Support tools which would have ADSIedit.msc included. ADSI Edit http://technet.microsoft.com/en-us/library/cc731547.aspx ADSI Edit (adsiedit.msc) http://technet.microsoft.com/en-us/library/cc773354(WS.10).aspx After you have installed it, you can follow the steps in article above to find the following entry:  Configuration [<domainController>.contoso.com]  CN=Configuration,DC=contoso,DC=com  CN=Services  CN=Microsoft Exchange  CN=<OrganizationName>  CN=Administrative Groups  CN=Exchange Administrative Group (<ID>)  CN=Servers After that, please delete the server which has dead. Regards, Xiu

Okay, here's what happened. The client access server could not be installed because it couldn't contact the old server, whom died. I received the error listed above. Well, I decided to start over with exchange all together, so in adsiedit I deleted the configuration --> services --> Exchange directories altogether, re-imaged the server because it was unable to contact anything to do a graceful uninstall and would have been hosed either way, and then installed exchange without a hitch.