"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

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:

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.

To resolve this issue, install the following update rollup:

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:Type: REG_SZ
Name: DSA Heuristics
Value: 000000000001

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