The WWAN service may crash after you resume a Windows 7-based computer from S3 sleep

Applies to: Windows 7 EnterpriseWindows 7 Home BasicWindows 7 Home Premium More

Not sure if this is the right fix? We've added this issue to our memory dump diagnostic which can confirm.

Symptoms


Consider the following scenario:
  • You connect to the Internet through a mobile broadband connection on a computer that is running Windows 7.
  • You enable the Always connect automatically option for the connection.
  • You resume the computer from S3 sleep.
In this scenario, the WWAN (wireless wide-area network) service may crash. Therefore, the mobile broadband connection cannot be reconnected. 

Note You have to restart the computer to recover from this issue.

Cause


This issue occurs because of a deadlock situation in the Windows Mobile Broadband Service (WWANSvc).

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 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
    6.1.760
    0.16xxx
    Windows 7RTMGDR
    6.1.760
    0.20xxx
    Windows 7RTMLDR
    6.1.760
    1.17xxx
    Windows 7SP1GDR
    6.1.760
    1.21xxx
    Windows 7SP1LDR
  • GDR service branches contain only those fixes that are widely released to address widespread, very mportant issues. LDR service branches contain hotfixes in addition to widely released fixes.
  • 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 very important for maintaining 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
Wwanprotdim.dll8.1.7600.1678540,96022-Mar-201104:41x86
Wwansvc.dll8.1.7600.16785185,85622-Mar-201104:41x86
Wwan_profile_v1.xsdNot applicable6,20110-Jun-200921:42Not applicable
Wwanprotdim.dll8.1.7600.2093040,96022-Mar-201104:45x86
Wwansvc.dll8.1.7600.20930185,85622-Mar-201104:45x86
Wwan_profile_v1.xsdNot applicable6,20110-Jun-200921:42Not applicable
Wwanprotdim.dll8.1.7601.1751440,96020-Nov-201012:21x86
Wwansvc.dll8.1.7601.17583185,85622-Mar-201104:38x86
Wwan_profile_v1.xsdNot applicable6,20110-Jun-200921:42Not applicable
Wwanprotdim.dll8.1.7601.1751440,96020-Nov-201012:21x86
Wwansvc.dll8.1.7601.21689185,85622-Mar-201104:27x86
Wwan_profile_v1.xsdNot applicable6,20110-Jun-200921:42Not applicable
For all supported x64-based versions of Windows 7
File nameFile versionFile sizeDateTimePlatform
Wwanprotdim.dll8.1.7600.1678548,64022-Mar-201105:22x64
Wwansvc.dll8.1.7600.16785229,88822-Mar-201105:22x64
Wwan_profile_v1.xsdNot applicable6,20110-Jun-200921:03Not applicable
Wwanprotdim.dll8.1.7600.2093048,64022-Mar-201105:25x64
Wwansvc.dll8.1.7600.20930229,88822-Mar-201105:25x64
Wwan_profile_v1.xsdNot applicable6,20110-Jun-200921:03Not applicable
Wwanprotdim.dll8.1.7601.1751448,64020-Nov-201013:27x64
Wwansvc.dll8.1.7601.17583229,88822-Mar-201105:25x64
Wwan_profile_v1.xsdNot applicable6,20110-Jun-200921:03Not applicable
Wwanprotdim.dll8.1.7601.1751448,64020-Nov-201013:27x64
Wwansvc.dll8.1.7601.21689229,88822-Mar-201105:16x64
Wwan_profile_v1.xsdNot applicable6,20110-Jun-200921:03Not applicable

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 mobile broadband, visit the following Microsoft website:For more information about how to use mobile broadband, visit the following Microsoft website: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 size2,285
Date (UTC)22-Mar-2011
Time (UTC)15:02
PlatformNot applicable
File nameX86_51a9f92988e2afcf4d7eaf64fb9da9c5_31bf3856ad364e35_6.1.7600.20930_none_8a6ed33bf0975d1a.manifest
File versionNot applicable
File size695
Date (UTC)22-Mar-2011
Time (UTC)15:02
PlatformNot applicable
File nameX86_cb5cedcbf3a04bf1d7476465cf1c9fe5_31bf3856ad364e35_6.1.7601.21689_none_e6f3549a2a05a66f.manifest
File versionNot applicable
File size695
Date (UTC)22-Mar-2011
Time (UTC)15:02
PlatformNot applicable
File nameX86_ccac5455603b9b09abefb121eacf2bdd_31bf3856ad364e35_6.1.7600.16785_none_be4b73f859be731b.manifest
File versionNot applicable
File size695
Date (UTC)22-Mar-2011
Time (UTC)15:02
PlatformNot applicable
File nameX86_dcfa2d3b6b1480fa371ba85462796b3a_31bf3856ad364e35_6.1.7601.17583_none_12bf76bcf27cac4e.manifest
File versionNot applicable
File size695
Date (UTC)22-Mar-2011
Time (UTC)15:02
PlatformNot applicable
File nameX86_microsoft-windows-wwansvc_31bf3856ad364e35_6.1.7600.16785_none_a144f4a7806a0c1a.manifest
File versionNot applicable
File size49,377
Date (UTC)22-Mar-2011
Time (UTC)05:10
PlatformNot applicable
File nameX86_microsoft-windows-wwansvc_31bf3856ad364e35_6.1.7600.20930_none_a1ffa18299639ea3.manifest
File versionNot applicable
File size49,377
Date (UTC)22-Mar-2011
Time (UTC)05:08
PlatformNot applicable
File nameX86_microsoft-windows-wwansvc_31bf3856ad364e35_6.1.7601.17583_none_a32951197d924558.manifest
File versionNot applicable
File size51,347
Date (UTC)22-Mar-2011
Time (UTC)15:07
PlatformNot applicable
File nameX86_microsoft-windows-wwansvc_31bf3856ad364e35_6.1.7601.21689_none_a3b8efa096aa7d2c.manifest
File versionNot applicable
File size51,347
Date (UTC)22-Mar-2011
Time (UTC)15:07
PlatformNot applicable
Additional files for all supported x64-based versions of Windows 7
File nameAmd64_218df93ab037b8dbb787b8033724090b_31bf3856ad364e35_6.1.7600.16785_none_22d4c5270e775198.manifest
File versionNot applicable
File size699
Date (UTC)22-Mar-2011
Time (UTC)15:02
PlatformNot applicable
File nameAmd64_73b80caf1490838b3e23be4ea392179c_31bf3856ad364e35_6.1.7601.17583_none_87e4ff80f874fadb.manifest
File versionNot applicable
File size699
Date (UTC)22-Mar-2011
Time (UTC)15:02
PlatformNot applicable
File nameAmd64_9c1725a4fae27afe4bd70fe0b3fe9a00_31bf3856ad364e35_6.1.7600.20930_none_f0f0f2ac2cda8cee.manifest
File versionNot applicable
File size699
Date (UTC)22-Mar-2011
Time (UTC)15:02
PlatformNot applicable
File nameAmd64_e11a4975c2c1f9cc4b104133150cb27d_31bf3856ad364e35_6.1.7601.21689_none_50f64abaf7a79173.manifest
File versionNot applicable
File size699
Date (UTC)22-Mar-2011
Time (UTC)15:02
PlatformNot applicable
File nameAmd64_microsoft-windows-wwansvc_31bf3856ad364e35_6.1.7600.16785_none_fd63902b38c77d50.manifest
File versionNot applicable
File size49,381
Date (UTC)22-Mar-2011
Time (UTC)06:10
PlatformNot applicable
File nameAmd64_microsoft-windows-wwansvc_31bf3856ad364e35_6.1.7600.20930_none_fe1e3d0651c10fd9.manifest
File versionNot applicable
File size49,381
Date (UTC)22-Mar-2011
Time (UTC)06:12
PlatformNot applicable
File nameAmd64_microsoft-windows-wwansvc_31bf3856ad364e35_6.1.7601.17583_none_ff47ec9d35efb68e.manifest
File versionNot applicable
File size51,351
Date (UTC)22-Mar-2011
Time (UTC)15:03
PlatformNot applicable
File nameAmd64_microsoft-windows-wwansvc_31bf3856ad364e35_6.1.7601.21689_none_ffd78b244f07ee62.manifest
File versionNot applicable
File size51,351
Date (UTC)22-Mar-2011
Time (UTC)15:03
PlatformNot applicable
File nameUpdate.mum
File versionNot applicable
File size2,301
Date (UTC)22-Mar-2011
Time (UTC)15:02
PlatformNot applicable