Microsoft KB Archive/940779

= Error message when you use Communicator 2007 to externally connect to the Communications Server 2007 Web Components by using ISA Server: &quot;Cannot Synchronize Address Book&quot; =

Article ID: 940779

Article Last Modified on 8/15/2007

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APPLIES TO


 * Microsoft Office Communications Server 2007 Enterprise Edition
 * Microsoft Office Communications Server 2007 Standard Edition

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SYMPTOMS
You use Microsoft Office Communicator 2007 to externally connect to the Microsoft Office Communications Server 2007 Web Components by using Microsoft Internet Security and Acceleration (ISA) Server 2004 or ISA Server 2006.

When you do this, you receive the following error message:

Cannot Synchronize Address Book

When you click More details, you receive the following error message:

Cannot synchronize with the corporate address book. The cause of this problem is unknown. Please contact your system administrator with this information.

This problem occurs if the following conditions are true:
 * You used the Communications Certificate Wizard in Communications Server 2007 to create a certificate that uses the default settings.
 * You assigned the certificate to the Communications Server 2007 Web Components that are hosted by Internet Information Services (IIS).



CAUSE
This problem occurs because the subject name of the certificate is listed last in the Subject Alternative Names list. ISA Server requires the subject name to be listed first in the Subject Alternative Names list.

Note To confirm the cause of this problem, you can use IIS Manager to determine whether the subject name is listed first in the Subject Alternative Names list. To do this, follow these steps:
 * 1) Open IIS Manager.
 * 2) Expand the computer name, and then expand Web Site.
 * 3) Right-click Default Web Site, and then click Properties.
 * 4) On the Directory Security tab, click View Certificate.
 * 5) On the Details tab, click All in the Show list, and then click Subject Alternative Names.



RESOLUTION
To resolve this problem, create a certificate for the Web Components by using the Communications Certificate Wizard in Communications Server 2007. Make sure that one of the following conditions is true:
 * The subject name for the certificate is listed first in the Subject Alternative Names list.
 * The Subject Alternative Names list is blank.

To create the certificate by using the Communications Certificate Wizard, follow these steps:
 * 1) In the Communications Server 2007 add-in, right-click the server, and then click Certificates.
 * 2) In the Communications Certificate Wizard, click Next.
 * 3) Click Create a new certificate, and then click Next.
 * 4) Click to select either the Send the request immediately to an online certification authority check box or the Prepare the request now, but send it later check box, and then click Next.
 * 5) In the Name text box, type the name, and then click Next.
 * 6) In the Organization text box, type the organization name.
 * 7) In the Organization unit text box, type the organization unit name, and then click Next.
 * 8) In the Subject name text box, type the Fully Qualified Domain Name (FQDN) of the server, leave the Subject Alternative Name field blank, and then click Next.
 * 9) Follow the instructions to finish the Communications Certificate Wizard.



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section.

Keywords: kbtshoot kbexpertiseinter kbprb KB940779

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