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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
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