What does HRESULT 0xC00D4286 (MF_E_NET_PROXY_ACCESSDENIED) mean?

 
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MF_E_NET_SERVER_ACCESSDENIED MF_E_NET_CANNOTCONNECT

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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