IIS crashes occasionally when a request is sent to a default document in Windows 8.1 or Windows Server 2012 R2

Applies to: Windows Server 2012 R2 DatacenterWindows Server 2012 R2 StandardWindows Server 2012 R2 Essentials More

Symptoms


Assume that you have a web application that is hosted on a server that is running Internet Information Services (IIS) 8.5. A request is sent to a default document on the server, and more than four IIS server variables exist. In this situation, IIS that is running on the server crashes occasionally.

Resolution


To resolve this issue, we have released an update rollup and a hotfix for Windows 8.1 and Windows Server 2012 R2.

Before you install this hotfix, check the prerequisite of the hotfix.

Get the update rollup for Windows 8.1 and Windows Server 2012 R2

To resolve this issue, install the update rollup that is dated December 2014. 

Get the December 2014 update rollup for Windows RT 8.1, Windows 8.1, or Windows Server 2012 R2

Get the hotfix for Windows 8.1 and Windows Server 2012 R2

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that described in this article. Apply this hotfix only to systems that are experiencing the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix Download Available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, go to the following Microsoft website: Note The "Hotfix Download Available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Hotfix detail information

Prerequisites
To apply this hotfix, you must first install update 2919355 on Windows 8.1 or Windows Server 2012 R2. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
2919355 Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 Update April, 2014
Registry information
To use the hotfix in this package, you do not have to make any changes to the registry.
Restart requirement
You may have to restart the computer after you apply this hotfix.
Hotfix replacement information
This hotfix does not replace a previously released hotfix.

Status


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

More Information


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