[TIP] - CNAME Windows Server 2008 R2 x Windows XP You were not connected because a duplicate name exists on the network

[TIP] - CNAME Windows Server 2008 R2 x Windows XP

Hello ALL, this topic was shared by a friend a long time ago I don't know if still are WinXP SP3 running around the world ;-)

 Maybe you can facing with some similar issues when you have Windows XP workstation versus Windows Server 2008 R2 as File Server.

Symptom

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When you try access the SMB File Share between Windows XP workstation and File Server Windows Server 2008 R2 thru CNAME you may yield with the following error message:

Example: Start \\alias\shared_folder

"You were not connected because a duplicate name exists on the network. Go to System in Control Panel to change the computer name and try again"

To solve this issue we need to access the Win2K8 R2 File Shared Server and make the following procedure below.

Resolution

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1. Locate and click the following key in the registry:

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\LanmanServer\Parameters

2. 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

3. Restart the Server.

This behavior occurs because the client machines with Windows XP use the NTLM authentication method by default, the server responds to XP Client with the status of "not listening" on the alias name, and therefore does not accept connections directed to the CNAME created . By default machines running Windows Vista and Windows 7 already use Kerberos authentication method there is no need to create this registry key.

For customers with Windows XP is by design.

Hope it helps J

Credits by 'Carlos Eduardo G. de Oliveira'