What does HRESULT 0xC00D11C2 (NS_E_WMP_MULTICAST_DISABLED) mean?

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Windows Media Player cannot play the file because the multicast protocol is not enabled. On the Tools menu, click Options, click the Network tab, and then select the Multicast check box.%0

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NS_E_WMP_CONNECT_TIMEOUT	NS_E_WMP_SERVER_DNS_TIMEOUT

NS_E_WMP_MULTICAST_DISABLED

Diagnosing NS_E_WMP_MULTICAST_DISABLED in the Windows Media Player playback path

NS_E_WMP_MULTICAST_DISABLED (0xC00D11C2) is returned when the Player configuration disallows multicast reception for a multicast stream.

The stream can be valid while local Player policy forbids multicast reception. Verify the multicast setting and the same URL before investigating firewall or codec causes.

Controlled playback comparison

Capture the resource identity and multicast option, group and port, interface selection, policy values and unicast alternative.
Verify that the caller uses the current Playlist, Media, Network, graph, device or DRM object instance.
Run the narrow experiment: enable multicast in a controlled environment and join the exact group on the intended interface.
Do not combine this focused test with a codec-pack change, Player reset, or broad registry cleanup.
If the retest returns a different specific HRESULT, diagnose that new failure as the next stage.

Actions that obscure the cause

adding a unicast proxy for a multicast group address.

Technical references

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