Outlook Web App cross-site silent redirection does not work in Exchange Server 2013

Consider the following scenario:

You have two Active Directory sites in a Microsoft Exchange Server 2013 environment that has Cumulative Update 3 installed.
Each site has a different External URL configured.
Form-based authentication is configured for Outlook Web App virtual directories in both Active Directory sites.
You have set cross-site silent redirection for Outlook Web App.
A user accesses another site’s Outlook Web App URL.

In this scenario, the user sees a manual redirection message and the External URL of the Client Access server in the other Active Directory site. We expect that the user experiences silent redirection to the External URL.

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This issue occurs because of a logic defect in Outlook Web App proxy and redirection.

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To resolve this issue, install the following service pack:

2926248

(http://support.microsoft.com/kb/2926248/ )

Description of Exchange Server 2013 Service Pack 1

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

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For more information about how to set form-based authentication by running the Set-OwaVirtualDirectory cmdlet, go to the following Microsoft website:

General information about the Set-OwaVirtualDirectory cmdlet

(http://technet.microsoft.com/en-us/library/bb123515(v=exchg.150).aspx)

For more information about how to configure Outlook Web App virtual directories, go to the following Microsoft website:

How to view or configure Outlook Web App virtual directories

(http://technet.microsoft.com/en-us/library/dd298140(v=exchg.150).aspx)

For more information about proxying and redirection, go to the following Microsoft website:

General information about proxying and redirection

(http://technet.microsoft.com/en-us/library/bb310763(v=exchg.141).aspx)

For more information about Outlook Web App cross-site silent redirection, go to the following Microsoft website:

OWA Cross-Site Silent Redirection in Exchange 2010 SP2

(http://blogs.technet.com/b/exchange/archive/2011/12/12/owa-cross-site-silent-redirection-in-exchange-2010-sp2.aspx)

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