Disabling Strict Name Checking

When a client computer connects to a Microsoft Windows 2000 or 2003 Server by using an alias name, the client may receive the following error message:

"System error 52 has occurred. A duplicate name exists on the network."

This problem can occur when you try to connect to the server by using a CNAME alias that is created in the DNS zone. The server is not "listening" on the alias, and therefore is not accepting connections to that name.

To resolve the issue, disable strict name checking.

1. Create the CNAME record for the file server on the appropriate DNS server, if the CNAME record is not already present.
2. Apply the following registry change to the file server. To do so, follow these steps:
3. Start Registry Editor (Regedt32.exe).
4. Locate and click the following key in the registry:
   HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\LanmanServer\Parameters
5. 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
6. Quit Registry Editor.
7. Restart your computer.

More information regarding this issue can be found in the following KB article:
http://support.microsoft.com/kb/281308

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