Error Message "Could Not Register Smtpfltr.dll" Occurs When You Attempt to Install ISA Server in an Array

This article was previously published under Q284761

SYMPTOMS

When you attempt to install Internet Security and Acceleration (ISA) Server in an array, you may receive the following error message:

ISA could not register Smtpfltr.dll.

The Installation log reports an "80070002" error code.

This problem occurs if there are duplicate entries in the Directory Services database for the ISA Server array.

To resolve this issue, see to the following Microsoft Knowledge Base article and obtain the fix that is included in that article:

813865 (http://support.microsoft.com/kb/813865/ ) FIX: Multiple registered Web filters in Active Directory are handled incorrectly

Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.

kbenv kbnofix kbprb KB284761

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