Consider the following scenario:
You access a web application by using the Active Directory Federation Services (AD FS) Web Application Proxy (WAP) that is running on a Windows Server 2012 R2-based computer.
Data that contains non-ASCII characters (such as ä) is passed to the web application through the query string of a URL (for example, you open an item that contains non-ASCII characters).
In this scenario, you notice that the data is not encoded correctly, and the web application may not work.
This issue occurs because the AD FS WAP cannot encode the URL correctly if the URL contains non-ASCII characters.
To resolve this issue, install update rollup 2975719. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
2975719 August 2014 update rollup for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates