Wildcard causes Offline Files Service crash in Slow-Link plicy

Article ID: 2801075 - View products that this article applies to.
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Symptoms

In Windows 7 Offline Files Policies,

Computer(User) Configuration\Administrative Templates\Network\Offline Files\Configure Slow-Link mode

This policy setting controls the network latency and throughput thresholds that will cause a client computers to transition files and folders that are already available offline to the slow-link mode so that the user's access to this data is not degraded due to network slowness.

If you enable this policy setting, Offline Files uses the slow-link mode if the network throughput between the client and the server is below (slower than) the Throughput threshold parameter, or if the round-trip network latency is above (slower than) the Latency threshold parameter.

You can configure the slow-link mode by specifying threshold values for Throughput (in bits per second) and/or Latency (in milliseconds) for specific UNC paths.

In this policy Options guide, it suggests:

To enable the slow-link mode to apply to all shares on a server named "server" when network latency is greater than 50ms:

Value Name=\\server\* Value="Latency=50"

To enable the slow link mode to apply to the share named "\\server\share" when network throughput is less than 10000 bits per second:

Value Name="\\server\share\*"

Value="Throughput=10000" 

Here, in the Value Name of UNC path, there's a "\*" referring "all the subfolders under current path".



However, the Wildcard("\*) doesnt apply to every scenario. For example,

If you have a UNC path like \\server\share\dir1\dir2\* you want to set Slow-link on, the Offline Files service will fail or crash when handling the slow-link policy parameters.

Cause

If user configured path for slowlink is bigger than \\server\share like \\server\share\dir1\dir2\*,Offline Files service tried to find match policy when transitioning the path \\server\share\dir1\dir2 to offline/online, it would find the invalid policy which  does not contain user configured latency/throughput. Then the Offline Files service crash due to this issue.

Resolution

Do not apply "\*" with UNC path that is longer than \\server\share;

More information

This is a known issue in Windows. This issue has been fixed in Windows 8.
Note This is a "FAST PUBLISH" article created directly from within the Microsoft support organization. The information contained herein is provided as-is in response to emerging issues. As a result of the speed in making it available, the materials may include typographical errors and may be revised at any time without notice. See Terms of Use for other considerations.

Properties

Article ID: 2801075 - Last Review: January 10, 2013 - Revision: 1.0
Applies to
  • Windows 7 Enterprise
  • Windows 7 Home Premium
  • Windows 7 Professional
Keywords: 
KB2801075

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