Article ID: 977967 - View products that this article applies to.
In a Microsoft Exchange Server 2010 environment, you use Microsoft Office Outlook Web App to log on to Exchange Control Panel. When you select Options, a logon prompt is presented again for authentication. However, you should have a single sign-on experience and the prompt should not appear.
This issue occurs because the Outlook Web App virtual directories and Exchange Control Panel virtual directories do not have the same authentication settings.
To resolve this issue, you must verify that the Exchange Server 2007 Client Access server has the same exact authentication settings for Outlook Web App and Exchange Control Panel . To do this, follow these steps: