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"Could not connect to a directory server" error message when you click the “last page” button in the search results in Exchange Server 2007 OWA

Article ID: 2498924 - View products that this article applies to.

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SYMPTOMS

Consider the following scenario:

You have a domain controller that is running Windows Server 2008 R2 in a Microsoft Exchange Server 2007 environment.
You log on to a mailbox by using Microsoft Office Outlook Web Access (OWA), and then you open the global address list (GAL).
You type a search term, and more than one page of search results is returned.
You click the “last page” button.

In this scenario, you receive the following error message:

Could not connect to a directory server. If the problem continues, contact technical support for your organization.

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CAUSE

This issue occurs because Exchange Server 2007 changes the query parameters between pages. Therefore, strict search hash checking fails on the Windows Server 2008 R2-based domain controller.

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RESOLUTION

To resolve this issue, install the following update rollup:

2509911

(http://support.microsoft.com/kb/2509911/ )

Description of Update Rollup 4 for Exchange Server 2007 Service Pack 3

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To work around the issue, disable strict search hash checking on all Windows Server 2008 R2-based domain controllers in the Exchange Server 2007 environment. To do this, add the following registry subkey on all the Windows Server 2008 R2-based domain controllers:

Subkey path:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\NTDS\Parameters

Type: REG_SZ
Name: DSA Heuristics
Value: 000000000001

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