Windows Media Player cannot pass proxy authentication in Windows 7

Symptoms

Consider the following scenario in a network environment:
  • You configure a proxy server to use authentication.
  • You configure the Internet access settings on the proxy server to give the Windows Media Player clients access to Internet content through the proxy server.
  • You try to play some Internet content in Windows Media Player on a computer that is running Windows 7.
In this scenario, the content cannot be played, and Windows Media Player cannot pass proxy authentication.

Resolution

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 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, visit 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, you must be running Windows 7 or Windows 7 Service Pack 1 (SP1).

For more information about how to obtain a Windows 7 or a Windows Server 2008 R2 service pack, click the following article number to view the article in the Microsoft Knowledge Base:

976932 Information about Service Pack 1 for Windows 7 and for Windows Server 2008 R2

Registry information

To use the hotfix in this package, you do not have to make any changes to the registry.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

File information

The global 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 7 file information notes
  • 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 7" 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 7
File nameFile versionFile sizeDateTimePlatform
Mf.dll12.0.7600.209123,182,59201-Mar-201108:08x86
Mferror.dll12.0.7600.163852,04814-Jul-200901:06x86
Mfpmp.exe12.0.7600.1638523,04014-Jul-200901:14x86
Mfps.dll12.0.7600.16385103,42414-Jul-200901:15x86
Rrinstaller.exe11.0.7600.1638550,17614-Jul-200901:14x86
Mf.dll12.0.7601.216713,207,68001-Mar-201108:08x86
Mferror.dll12.0.7600.163852,04814-Jul-200901:06x86
Mfpmp.exe12.0.7600.1638523,04014-Jul-200901:14x86
Mfps.dll12.0.7600.16385103,42414-Jul-200901:15x86
Rrinstaller.exe11.0.7600.1638550,17614-Jul-200901:14x86
For all supported x64-based versions of Windows 7
File nameFile versionFile sizeDateTimePlatform
Mf.dll12.0.7600.209124,068,86401-Mar-201108:09x64
Mferror.dll12.0.7600.163852,04814-Jul-200901:28x64
Mfpmp.exe12.0.7600.1638524,57614-Jul-200901:39x64
Mfps.dll12.0.7600.20912206,84801-Mar-201108:09x64
Rrinstaller.exe11.0.7600.1638555,80814-Jul-200901:39x64
Mf.dll12.0.7601.216714,120,06401-Mar-201108:13x64
Mferror.dll12.0.7600.163852,04814-Jul-200901:28x64
Mfpmp.exe12.0.7600.1638524,57614-Jul-200901:39x64
Mfps.dll12.0.7601.17514206,84820-Nov-201013:26x64
Rrinstaller.exe11.0.7600.1638555,80814-Jul-200901:39x64
Mf.dll12.0.7600.209123,182,59201-Mar-201108:08x86
Mferror.dll12.0.7600.163852,04814-Jul-200901:06x86
Mfpmp.exe12.0.7600.1638523,04014-Jul-200901:14x86
Mfps.dll12.0.7600.16385103,42414-Jul-200901:15x86
Rrinstaller.exe11.0.7600.1638550,17614-Jul-200901:14x86
Mf.dll12.0.7601.216713,207,68001-Mar-201108:08x86
Mferror.dll12.0.7600.163852,04814-Jul-200901:06x86
Mfpmp.exe12.0.7600.1638523,04014-Jul-200901:14x86
Mfps.dll12.0.7600.16385103,42414-Jul-200901:15x86
Rrinstaller.exe11.0.7600.1638550,17614-Jul-200901:14x86

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

Additional file information

Additional file information for Windows 7

Additional files for all supported x86-based versions of Windows 7
File nameUpdate.mum
File versionNot applicable
File size2,280
Date (UTC)01-Mar-2011
Time (UTC)23:00
PlatformNot applicable
File nameX86_1d176412f226b5930cf27485753cc059_31bf3856ad364e35_6.1.7600.20912_none_e4fb72c166cbbe96.manifest
File versionNot applicable
File size703
Date (UTC)01-Mar-2011
Time (UTC)23:00
PlatformNot applicable
File nameX86_7b4a0e83d8c1f0aa451b3cdfb2046d73_31bf3856ad364e35_6.1.7601.21671_none_733c71130a436987.manifest
File versionNot applicable
File size703
Date (UTC)01-Mar-2011
Time (UTC)23:00
PlatformNot applicable
File nameX86_microsoft-windows-mediafoundation_31bf3856ad364e35_6.1.7600.20912_none_9d07da3e86fcc1e5.manifest
File versionNot applicable
File size265,911
Date (UTC)01-Mar-2011
Time (UTC)23:03
PlatformNot applicable
File nameX86_microsoft-windows-mediafoundation_31bf3856ad364e35_6.1.7601.21671_none_9eac558c8454bef9.manifest
File versionNot applicable
File size265,911
Date (UTC)01-Mar-2011
Time (UTC)23:03
PlatformNot applicable
Additional files for all supported x64-based versions of Windows 7
File nameAmd64_3d814d74fa2cc462bebfa8724915ebcb_31bf3856ad364e35_6.1.7601.21671_none_c3a91d4f265c6c99.manifest
File versionNot applicable
File size1,056
Date (UTC)01-Mar-2011
Time (UTC)23:00
PlatformNot applicable
File nameAmd64_988f4af487a86732bc70b84f020af37b_31bf3856ad364e35_6.1.7600.20912_none_ee25b4d554fde366.manifest
File versionNot applicable
File size1,056
Date (UTC)01-Mar-2011
Time (UTC)23:00
PlatformNot applicable
File nameAmd64_microsoft-windows-mediafoundation_31bf3856ad364e35_6.1.7600.20912_none_f92675c23f5a331b.manifest
File versionNot applicable
File size265,915
Date (UTC)01-Mar-2011
Time (UTC)23:00
PlatformNot applicable
File nameAmd64_microsoft-windows-mediafoundation_31bf3856ad364e35_6.1.7601.21671_none_facaf1103cb2302f.manifest
File versionNot applicable
File size265,915
Date (UTC)01-Mar-2011
Time (UTC)23:00
PlatformNot applicable
File nameUpdate.mum
File versionNot applicable
File size2,296
Date (UTC)01-Mar-2011
Time (UTC)23:00
PlatformNot applicable
File nameWow64_microsoft-windows-mediafoundation_31bf3856ad364e35_6.1.7600.20912_none_037b201473baf516.manifest
File versionNot applicable
File size162,389
Date (UTC)01-Mar-2011
Time (UTC)23:00
PlatformNot applicable
File nameWow64_microsoft-windows-mediafoundation_31bf3856ad364e35_6.1.7601.21671_none_051f9b627112f22a.manifest
File versionNot applicable
File size162,389
Date (UTC)01-Mar-2011
Time (UTC)23:00
PlatformNot applicable
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