High CPU usage and performance issues occur when access-based enumeration is enabled in Windows 8.1 or Windows 7

Symptoms

Consider the following scenario:
  • You have a computer that is running Windows 8.1, Windows RT 8.1, Windows Server 2012 R2, Windows 7 Service Pack 1 (SP1), or Windows Server 2008 R2 SP1.
  • You have access-based enumeration enabled on a shared folder. Or you enable access-based enumeration on a DFS namespace on a folder.
  • You use the Server Message Block 2.0 file-sharing protocol. By default, this protocol is used on Windows-based computers.
  • You try to browse the contents of the shared folder. Or you try to do any other standard work that involves shared files.

In this scenario, CPU usage of the server seems to spike close to 100 percent, and you may experience performance issues such as delays.

Resolution

Hotfix information

A supported hotfix is available from Microsoft Support. However, this hotfix is intended to correct only the problem that is 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.

Prerequisites

To apply this hotfix, install update 2919355 in Windows 8.1 or Windows Server 2012 R2. Or, install Service Pack 1 in Windows 7 or Windows Server 2008 R2.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any previously released hotfix.

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.

File Information

The English (United States) version of this software update installs files that have the attributes that are listed in the following tables. The dates and times for these files are listed in Coordinated Universal Time (UTC). Be aware that dates and times for these files on your local computer are displayed in your local time and with your current daylight saving time bias. The dates and times may also change when you perform certain operations on the files.
Windows 7 and Windows Server 2008 R2
Windows 8.1, Windows RT 8.1 and Windows Server 2012 R2
Additional file information
Proprietà

ID articolo: 2920591 - Ultima revisione: 10 dic 2015 - Revisione: 1

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