3.6.0 MxDB for SQL Server Installation and Administration Guide (5697-7088, December 2007)

Chapter 7: Troubleshooting 103
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Client Receives Error When Connecting via an Alias
A client computer receives the following error message when it connects
to a computer running Microsoft Windows Server 2003 by using an alias
name (for example, a virtual hostname).
System error 52 has occurred.
A duplicate name exists on the network.
To resolve this problem, complete the steps for Windows Server 2003 in
the following Microsoft KB article:
http://support.microsoft.com/kb/281308
NOTE: When Matrix Server is installed, it can create the appropriate
registry key automatically if desired.
Cannot Authenticate on the Local Machine with a
Virtual Host Name
To successfully authenticate on the local machine by the virtual host
name (for example, a Virtual SQL Server, Virtual Host, or Virtual CIFS
Server) the DisableLoopbackCheck flag must be set. Microsoft KB article
926642 documents the following procedure to do this.
To set the DisableLoopbackCheck registry entry to 1, follow these steps
on the client computer:
1. Click Start, click Run, type regedit, and then click OK.
2. Locate and then click the following registry subkey:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa
3. Right-click Lsa, point to New, and then click DWORD Value.
4. Type DisableLoopbackCheck, and then press ENTER.
5. Right-click DisableLoopbackCheck, and then click Modify.
6. In the Value data box, type 1, and then click OK.
7. Exit Registry Editor.
8. Restart the computer for the change to take effect.