After you run the Set-ExchangeServer command to set or exclude a static domain controller, a global domain controller, or a configuration domain controller on a Microsoft Exchange Server 2007 cluster node, the following error message is logged in the System log every three seconds:

Event Type: Error
Event Source: ClusSvc
Event Category: Database Mgr
Event ID: 1080
Date: 1/14/2008
Time: 5:39:42 PM
Description: Cluster service could not write to a file (C:\DOCUME~1\CLUSAD~1\LOCALS~1\Temp\CLS1627.tmp). The disk may be low on disk space, or some other serious condition exists.

The syntax of the Set-ExchangeServer command resembles the following.

Set-ExchangeServer cluster_mailbox_server_name -staticExcludedDomainControllers domain_controller_name 
-staticDomainControllers 
-staticGlobalCatalogs 
-id  
-staticConfigDomainController 

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This problem occurs because the Instance0 registry subkey is removed from the following subkey:

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To resolve this problem, copy the Instance0 registry subkey from the passive cluster node to the computer that is experiencing this problem. To do this, follow these steps:

1.	On the passive cluster node, click Start, click Run, type regedit, and then click OK.
2.	Click the following registry subkey: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchange ADAccess\Instance0
3.	On the File menu, click Export.
4.	Save the .reg file.
5.	On the computer that is experiencing the problem, double-click the .reg file that you saved in step 4, and then click Yes to add the information to the registry.
6.	Perform a failover of the Exchange Cluster group.

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Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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