What does HRESULT 0xC00D11BD (NS_E_WMP_MMS_NOT_SUPPORTED) mean?

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Description:

Windows Media Player cannot play the file because the specified protocol is not supported. If you typed a URL in the Open URL dialog box, try using a different transport protocol (for example, "mms:").%0

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NS_E_WMP_INVALID_LIBRARY_ADD	NS_E_WMP_NO_PROTOCOLS_SELECTED

NS_E_WMP_MMS_NOT_SUPPORTED

Diagnosing NS_E_WMP_MMS_NOT_SUPPORTED in the Windows Media Player playback path

NS_E_WMP_MMS_NOT_SUPPORTED (0xC00D11BD) is returned when the requested legacy MMS transport is unavailable in the installed Player path or for the target resource.

Treat this as a transport-capability result. Verify whether the same resource is available through a supported HTTP or RTSP path before changing codecs, credentials, or the media file itself.

Controlled playback comparison

Freeze the current object state and collect URL scheme, Player version, enabled protocols, server-supported alternatives and rollover trace.
Reproduce it once without automatic retries or fallback applications.
Change only one precondition: use the server-provided HTTP or RTSP URL for the same publishing point and compare session creation.
Compare the first nested status and next Player event with the failed run.
After testing it, restore the original configuration if the change was diagnostic only.

Actions that obscure the cause

changing mms:// to http:// without verifying the server exposes HTTP streaming.

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