Symptoms
After you upgrade Microsoft Exchange Server 2013 on a server that is running Windows 2012 or Windows 2012 R2, Outlook Web App (OWA) cannot be accessed. Additionally, you receive the following error message:
Error: "Could not load file or assembly 'AntiXSSLibraryError: "Could not load file or assembly 'AntiXSSLibrary, Version=4.2.0.0, Culture=neutral, PublicKeyToken=d127efab8a9c114f' or one of its dependencies"
When you check the Application log, you find entries that resemble the following:Log Name: ApplicationSource: ASP.NET 4.0.30319.0Date: date timeEvent ID: 1310Task Category: Web Eventvel: Warningvel: WarningEvent code: 3008 Event message: A configuration error has occurred. When you try to browse any of the Exchange Back End Website virtual directories, you receive the following error message:
Page cannot be displayed
Cause
This issue occurs if the upgrade post-setup process is not run for the Client Access role. In this situation, the "SharedWebConfig" file is missing on following path:
//%ExchangeInstallDir%Program Files\Microsoft\Exchange Server\V15\ClientAccess
Resolution
To fix this issue, install Cumulative Update 11 for Exchange Server 2013.
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
References
Learn about the terminology that Microsoft uses to describe software updates.
