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MF_E_NET_PROXY_ACCESSDENIED
MF_E_NET_PROXY_ACCESSDENIED means the proxy, not necessarily the origin media server, denied the request. The proxy can reject credentials, client identity, destination category, or the streaming protocol.
What to check
- Review proxy logs for the authentication challenge or policy rule that rejected the request.
- Verify that the application has credentials available for the proxy path.
- Confirm that the proxy allows the media protocol and destination, not only HTTPS browsing.
Microsoft: Network source authentication
Microsoft: Binding to proxy servers dynamically
Microsoft: Networking in Media Foundation
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