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Consider the following scenario:
In a Microsoft Exchange Server 2007 environment, the NetBIOS domain name does not match the first part of the fully qualified domain name (FQDN).
Microsoft Office Outlook Web Access is configured to use an authentication method other than forms-based authentication (FBA).
You run the Test-OwaConnectivity command to verify that Outlook Web Access is running correctly.
In this scenario, the Test-OwaConnectivity command returns the following error message:
WARNING: The test was unable to log on to Outlook Web Access because of an authentication failure. URL: xxxx Mailbox: xxxx User: xxxx WARNING: The test for URL 'xxxx' failed.
This issue occurs because Exchange Server rebuilds the network credential and uses only the NetBIOS domain name when non-FBA authentication methods are used. Authentication fails because the NetBIOS domain name does not match the FQDN in a disjoint namespace scenario.
To resolve this problem, install Update Rollup 7 for Exchange 2007 Service Pack 1.
For more information about Update Rollup 7 for Exchange Server 2007 Service Pack 1, see the following Exchange Help topic: