Hi, I am replacing our Windows 2003 file server with a Windows 2008 R2 server. I have followed the registry change below to allow this server to be accessed (via SMB shares and drive letters) from XP and above machines: Create the CNAME record for the file server on the appropriate DNS server, if the CNAME record is not already present. Apply the following registry change to the file server. To do so, follow these steps: Start Registry Editor (Regedt32.exe). Locate and click the following key in the registry: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\LanmanServer\Parameters On the Edit menu, click Add Value, and then add the following registry value: Value name: DisableStrictNameChecking Data type: REG_DWORD Radix: Decimal Value: 1 Quit Registry Editor. Restart your computer. It didn't work so on the new file server I also tried: setspn -a host/newservername oldservername It seems Windows 7 PC's can access the servers drive letters and shares using the CNAME but XP users can't. What can I do? Thanks

Hi, the warning "duplicate name exists on network" has nothing to do with DNS server, this warning is sent by NetBIOS thus duplicate name is registered or in WINS server or in server that is elected as master browser. To resolve this issue follow this KB article http://support.microsoft.com/kb/822659/en-us HTHEdoardo Benussi - Microsoft MVP Management Infrastructure - Systems Administration https://mvp.support.microsoft.com/Profile/Benussi Windows Server Italian Forum Moderator edo[at]mvps[dot]org

Use this registry setting OptionalNames: can be either Reg_SZ or Reg_Multi_SZ Add one or more names and restart the server service. This action registers the names in Windows Internet Name Service (WINS) If the "optionalname" was a pervious computer you must must delete the computer account in AD. Otherwise the following error message will appear when attempts to connect a share are made. Login Failure: The target account name is incorrect. [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\lanmanserver\parameters] "OptionalNames" More info http://social.technet.microsoft.com/Forums/en-US/winserverNIS/thread/e6a5f937-d51b-43c8-b94f-7f24c100b935