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The Remote Desktop Active X control Mstscax.dll leaks thread handles in Windows 8.1

View products that this article applies to.

Symptoms

When you exit a Remote Desktop connection in Windows 8.1, the handles are not closed. This causes a leak of thread handles in the Remote Desktop Active X control Mstscax.dll.

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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:
http://support.microsoft.com/contactus/?ws=support
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 update in Windows 8.1, you must first have update 2919355 installed.

Restart requirement

You may have to restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace any previously released hotfix.

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File information
The English (United States) version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.

Windows 8.1 file information and notes

Important Windows 8.1 and Windows Server 2012 R2 hotfixes are included in the same packages. However, only "Windows 8.1" is listed on the Hotfix Request page. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 8.1" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.
  • The files that apply to a specific product, milestone (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table.

    VersionProductMilestoneService branch
    6.3.960 0.17 xxxWindows 8.1RTMGDR
  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows 8.1 and Windows Server 2012 R2" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintain the state of the updated components. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.
For all supported x86-based versions of Windows 8.1
File nameFile versionFile sizeDateTimePlatform
Mstscax.dll6.3.9600.177946,213,12008-Apr-201522:42x86
Mstscax.mofNot Applicable2,05518-Jun-201312:26Not Applicable
Rdvidcrl.dll6.3.9600.17793856,06408-Apr-201502:20x86
Tsgqec.dll6.3.9600.1741552,73629-Oct-201401:43x86
For all supported x64-based versions of Windows 8.1
File nameFile versionFile sizeDateTimePlatform
Mstscax.dll6.3.9600.177947,032,32008-Apr-201522:48x64
Mstscax.mofNot Applicable2,05518-Jun-201314:55Not Applicable
Rdvidcrl.dll6.3.9600.177931,101,82408-Apr-201503:33x64
Tsgqec.dll6.3.9600.1741566,04829-Oct-201402:24x64
Mstscax.dll6.3.9600.177946,213,12008-Apr-201522:42x86
Mstscax.mofNot Applicable2,05518-Jun-201312:26Not Applicable
Rdvidcrl.dll6.3.9600.17793856,06408-Apr-201502:20x86
Tsgqec.dll6.3.9600.1741552,73629-Oct-201401:43x86

Additional file information for Windows 8.1

Additional files for all supported x86-based versions of Windows 8.1
File namePackage_1_for_kb3042836~31bf3856ad364e35~x86~~6.3.2.0.mum
File versionNot Applicable
File size1,852
Date (UTC)10-Apr-2015
Time (UTC)15:06
File namePackage_for_kb3042836_rtm_gm~31bf3856ad364e35~x86~~6.3.2.0.mum
File versionNot Applicable
File size1,405
Date (UTC)10-Apr-2015
Time (UTC)15:06
File namePackage_for_kb3042836_rtm~31bf3856ad364e35~x86~~6.3.2.0.mum
File versionNot Applicable
File size1,471
Date (UTC)10-Apr-2015
Time (UTC)15:06
File nameX86_7cb23d77880b410eab563e528ada19fb_31bf3856ad364e35_6.3.9600.17794_none_31c6ee9d18b4bab7.manifest
File versionNot Applicable
File size722
Date (UTC)10-Apr-2015
Time (UTC)15:06
File nameX86_microsoft-windows-t..s-clientactivexcore_31bf3856ad364e35_6.3.9600.17794_none_c482ed27e149f5e9.manifest
File versionNot Applicable
File size140,080
Date (UTC)10-Apr-2015
Time (UTC)17:32
Additional files for all supported x64-based versions of Windows 8.1
File nameAmd64_7cb23d77880b410eab563e528ada19fb_31bf3856ad364e35_6.3.9600.17794_none_8de58a20d1122bed.manifest
File versionNot Applicable
File size724
Date (UTC)10-Apr-2015
Time (UTC)15:06
File nameAmd64_7f49e69acb0f38496f5b931fcb37bb87_31bf3856ad364e35_6.3.9600.17794_none_779540091a9ac5a5.manifest
File versionNot Applicable
File size726
Date (UTC)10-Apr-2015
Time (UTC)15:06
File nameAmd64_microsoft-windows-t..s-clientactivexcore_31bf3856ad364e35_6.3.9600.17794_none_20a188ab99a7671f.manifest
File versionNot Applicable
File size140,086
Date (UTC)10-Apr-2015
Time (UTC)17:36
File namePackage_1_for_kb3042836~31bf3856ad364e35~amd64~~6.3.2.0.mum
File versionNot Applicable
File size2,096
Date (UTC)10-Apr-2015
Time (UTC)15:06
File namePackage_2_for_kb3042836~31bf3856ad364e35~amd64~~6.3.2.0.mum
File versionNot Applicable
File size2,086
Date (UTC)10-Apr-2015
Time (UTC)15:06
File namePackage_for_kb3042836_rtm_gm~31bf3856ad364e35~amd64~~6.3.2.0.mum
File versionNot Applicable
File size1,691
Date (UTC)10-Apr-2015
Time (UTC)15:06
File namePackage_for_kb3042836_rtm~31bf3856ad364e35~amd64~~6.3.2.0.mum
File versionNot Applicable
File size2,163
Date (UTC)10-Apr-2015
Time (UTC)15:06
File nameX86_microsoft-windows-t..s-clientactivexcore_31bf3856ad364e35_6.3.9600.17794_none_c482ed27e149f5e9.manifest
File versionNot Applicable
File size140,080
Date (UTC)10-Apr-2015
Time (UTC)17:36

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Status

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

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References

Learn about the terminology that Microsoft uses to describe software updates.

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Keywords: kbbug, kbsurveynew, kbexpertiseinter, kbautohotfix, kbhotfixserver, kbqfe, kb, kbfix

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Article Info
Article ID : 3042836
Revision : 1
Created on : 1/7/2017
Published on : 5/12/2015
Exists online : False
Views : 182