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You have to re-enter user credentials after you send credentials through the XMLHttpRequest object and view the page in a new tab in Internet Explorer 8
Article ID: 972844 - View products that this article applies to.
In Internet Explorer 8, the user credentials that are sent through the XMLHttpRequest object are not shared to other tab processes in the same Internet Explorer window.
Consider the following scenario:
Security update informationTo resolve this problem, install the most current cumulative security update for Internet Explorer. To install the most current update, visit the following Microsoft Web site:
http://update.microsoft.comFor more technical information about the most current cumulative security update for Internet Explorer, visit the following Microsoft Web site:
http://www.microsoft.com/technet/security/current.aspxNote This update was first included in security update Knowledge Base (KB) article 972260 (MS09-034). For more information, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/972260/ )MS09-034: Cumulative security update for Internet Explorer
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about the XMLHttpRequest object, visit the following Microsoft Web sites: