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What does HRESULT 0xC00D427C (MF_E_NET_UNSAFE_URL) mean?

 
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MF_E_NET_INCOMPATIBLE_SERVER MF_E_NET_CACHE_NO_DATA

MF_E_NET_UNSAFE_URL

MF_E_NET_UNSAFE_URL means the networking component rejected the URL before or during connection setup. Inspect the exact final URL, including redirect targets, rather than assuming the original URL is the one being evaluated.

What to check for MF_E_NET_UNSAFE_URL

  • Validate scheme, host, port, escaping, and redirect destinations.
  • Check whether application policy blocks a scheme change or an untrusted target.
  • Avoid attempting to bypass URL validation; correct the source URL or trust configuration instead.

Microsoft: Networking in Media Foundation

RFC 9110: HTTP semantics


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