A memory leak occurs on an RPC server that is running Windows Server 2008 after the RPC server function runs an RPC client callback function

Consider the following scenario:

• You make a remote procedure call (RPC) request on a Windows-based client to connect to an RPC server.
• The RPC server is running Windows Server 2008.
• The RPC server function runs an RPC client callback function on the RPC server.

In this scenario, a memory leak occurs on the RPC server.

The issue occurs because of a bug in the Rpcrt4.dll file. When an RPC client makes a call to an RPC server function, the RPC server function runs an RPC callback function that cannot free the callback reply buffer. This behavior causes a memory leak on the RPC server.

Hotfix information

A supported hotfix is available from Microsoft. 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 this specific problem. 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, visit the following Microsoft Web site: 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.

Important Windows Vista and Windows Server 2008 hotfixes are included in the same packages. However, only one of these products may be listed on the “Hotfix Request” page. To request the hotfix package that applies to both Windows Vista and Windows Server 2008, just select the product that is listed on the page.

Prerequisites

To apply this hotfix, you must have Windows Server 2008 installed on the RPC server.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.

Windows Server 2008, x86-based versions and Windows Vista, x86-based versions

Windows Server 2008, x64-based versions and Windows Vista, x64-based versions

Windows Server 2008, IA-64-based versions and Windows Vista, IA-64-based versions

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