HRESULT 0x400D4272 (MF_I_MANUAL_PROXY): meaning and diagnosis

Status / error code:

Category:

Constant name:

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Facility:

Operating System:

Description:

The proxy setting is manual.%0

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MF_S_ASF_PARSEINPROGRESS	MQ_INFORMATION_PROPERTY

MF_I_MANUAL_PROXY

Locate the failing boundary

MF_I_MANUAL_PROXY (0x400D4272) is a informational status from Windows Media Foundation. The generated section above already contains the platform message; the useful extra information is that this result isolates a network source has selected explicit proxy configuration rather than automatic discovery.

The producer is the Media Foundation proxy locator used while resolving a source URL, so diagnosis should begin with that object and its state rather than with a broad reinstall or an unrelated codec change. A representative occurrence is an application deliberately supplies a proxy property store and the locator reports that manual mode is active.

Evidence that survives retries

Observation	What to capture for `MF_I_MANUAL_PROXY`
Primary discriminator	the source URL, proxy host and port, bypass list, authentication mode, and the property store passed to source resolution
Owning object	the Media Foundation proxy locator used while resolving a source URL, including its object identity and generation
Timeline marker	the call immediately before a network source has selected explicit proxy configuration rather than automatic discovery and the completion event, callback, or state change that followed
Comparison artifact	one known-good run that changes only this condition: repeat resolution once with the documented manual proxy values and once with the same URL under automatic proxy discovery

The decisive boundary is a network source has selected explicit proxy configuration rather than automatic discovery. Preserve the original the Media Foundation proxy locator used while resolving a source URL and the first result in the chain: a later UI message can replace this precise code with a generic playback, setup, network, or device failure.

A controlled verification sequence

Record MF_I_MANUAL_PROXY, 0x400D4272, the returning method, process architecture, Windows build, and component version.
Capture the source URL, proxy host and port, bypass list, authentication mode, and the property store passed to source resolution before retry logic changes the object.
Perform this narrow comparison: repeat resolution once with the documented manual proxy values and once with the same URL under automatic proxy discovery.
For MF_I_MANUAL_PROXY, keep the input, account, URL, device, media type, and requested action unchanged unless one is the single tested variable.
After correcting MF_I_MANUAL_PROXY, create a fresh object or process where lifecycle state may have been retained, then repeat the original call.

What the result does not prove

MF_I_MANUAL_PROXY does not by itself prove a machine-wide media-platform failure. In this case, an actual connection failure occurs later and returns a network or proxy HRESULT. The MF_I_MANUAL_PROXY evidence does not justify deleting license stores, clearing every proxy setting, installing codec packs, or rewriting media files before its producer is identified.

Nearby results that mean something else

Result	Different checkpoint
`MF_E_UNEXPECTED`	An unexpected error has occurred in the operation requested; compare this boundary specifically with `MF_I_MANUAL_PROXY`.
`MF_E_INVALIDNAME`	Invalid name; compare this boundary specifically with `MF_I_MANUAL_PROXY`.
`MF_E_INVALIDTYPE`	Invalid type; compare this boundary specifically with `MF_I_MANUAL_PROXY`.

Repair at the owning layer

The supported corrective direction is to correct the explicit proxy endpoint or bypass rule; do not treat this informational result as a transport failure by itself. Success means more than disappearance of a dialog: the same method must pass the same checkpoint, the expected event or output must appear, and no broader fallback HRESULT should replace MF_I_MANUAL_PROXY.

For a MF_I_MANUAL_PROXY incident, keep the symbolic constant together with 0x400D4272. For MF_I_MANUAL_PROXY, that pairing preserves the checkpoint when signed integer fields or wrapper logs obscure the original Media Foundation or Windows Media facility.

Technical references

Media Foundation architecture — reference used for the MF_I_MANUAL_PROXY checkpoint.
Media Foundation error codes — reference used for the MF_I_MANUAL_PROXY checkpoint.
Proxy support for network sources — reference used for the MF_I_MANUAL_PROXY checkpoint.
Creating a media source from a URL — reference used for the MF_I_MANUAL_PROXY checkpoint.

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