Symptoms
Problem 1
When you try to stream audio or video from Microsoft Windows Media Services, you may receive an error message that resembles the following in Microsoft Windows Media Player:
The specified protocol is not supported.
Note This problem does not occur when you play content that is stored on a hard disk drive.
Problem 2
When you click the Network tab of the Windows Media Player Options menu, nothing happens.
Problem 3
On the Windows Media Player Network tab, the "Streaming proxy settings" protocol listing is empty.
Cause
This problem may occur if any one of the following conditions is true:
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The Wmnetmgr.dll file is unregistered.Note The Wmnetmgr.dll file is located in the C:\Windows\System32 folder.
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The Wmsdkns.xml file is corrupted.Note The file is Windows Media Player's network namespace file.
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The Wmsdkns.xml file has incorrect permissions.
Resolution
To resolve this problem, use one of the following methods.
Method 1
Register the Wmnetmgr.dll file by using an account that is in the Administrators group. At a command prompt, run the following command.
regsvr32 wmnetmgr.dll
Method 2
Make sure that the user account that is using Windows Media Player has Modify permissions for the Wmsdkns.xml file.Note In Windows Vista, the file is located in the C:\Users\Userame\AppData\Local\Microsoft\Windows Media\11.0 folder. In Windows XP, the file is located in the C:\Documents and Settings\UserName\Local Settings\Application Data\Microsoft\Windows Media\11.0 folder.
Method 3
Delete the Wmsdkns.xml file. After you delete it, Windows Media Player will re-create the Wmsdkns.xml file.
More Information
Steps to reproduce the problem
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Unregister the Wmnetmgr.dll file by using an account that is in the Administrators group. At the command prompt, run the following command.
regsvr32 /u wmnetmgr.dll
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Make sure that the user account that is using Windows Media Player has Deny permissions for the Wmsdkns.xml file.
