What does HRESULT 0xC00D4292 (MF_E_NET_UDP_BLOCKED) mean?

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MF_E_NET_UDP_BLOCKED means a network device is blocking UDP traffic required by the media path.

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MF_E_OFFLINE_MODE	MF_E_NET_UNSUPPORTED_CONFIGURATION

MF_E_NET_UDP_BLOCKED

MF_E_NET_UDP_BLOCKED indicates that a device on the path is blocking UDP. Media Foundation can be configured to use different supported network transports, so this is a transport-policy diagnosis rather than a codec issue.

What to check

Verify firewall, NAT, VPN, and enterprise security rules for the UDP flow.
Confirm whether the source can use TCP or HTTP as an allowed fallback.
Log the chosen protocol and transport so the failure is not mistaken for a generic timeout.

Microsoft: Supported protocols for Media Foundation network sources

Microsoft: Media Foundation client logging

Microsoft: Networking in Media Foundation

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