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Saturday, April 5, 2008

A duplicate name exist error when connecting to SMB share using CNAME alias

Description
When you are setting up CNAME alias in DNS for a Windows 2003 Server and then try to connect to server using CNAME alias, you may encounter "a duplicate name exists on the network" error.

Resolution
To resolve this problem in Windows Server 2003, complete the following steps:
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:
a. Start Registry Editor (Regedt32.exe).
b. Locate and click the following key in the registry:
HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\LanmanServer\Parameters
c. On the Edit menu, click Add Value, and then add the following registry value:
Value name: DisableStrictNameCheckingData

type: REG_DWORD
Radix: Decimal
Value: 1
d. Quit Registry Editor.
3. Restart your computer.

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