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NS_E_CACHE_NOT_MODIFIED
Mechanism and scope
This result (0xC00D13F1) marks origin revalidation confirms that the cached representation is still current. Although the visible symptom may be interrupted playback, this HRESULT is raised during an administrative or distribution operation.
The cache/proxy layer first applies policy, then decides whether to serve local content, revalidate it, contact an origin server, proxy it, redirect the client or reject the request; those decisions are separate from ordinary player buffering. In the trace, keep the cache key, origin validators and policy decision together. When diagnosing this result, a cache proxy behaves both as a server to the player and as a client to the origin.
Evidence that separates this code
| First lower-level result | Preserve the earliest Win32, socket, COM, parser or plug-in event before the HRESULT; later wrappers can map several causes to this result. |
| Controlled comparison | Use a known-good object of the same type and vary only the precondition described as “origin revalidation confirms that the cached representation is still current”. |
Related codes are different
Primary distinction: this is a control result equivalent to successful revalidation, not a playback failure.
| Nearby result | Different condition |
|---|---|
NS_E_CACHE_ARCHIVE_CONFLICT | a cache download/archive operation overlaps another incompatible operation for the same content. |
NS_E_CACHE_CANNOT_BE_CACHED | origin metadata or cache policy forbids Windows Media Services from storing the requested content. |
NS_E_CACHE_ORIGIN_SERVER_NOT_FOUND | the cache proxy cannot resolve or select the configured origin server. |
Code-specific failure anatomy
A representative occurrence is when origin revalidation confirms that the cached representation is still current. Capture cached version validators, origin response status, expiration time, cache key and selected local object together with the object instance and the exact administrative or protocol request.
For a useful negative control, serve the validated cached object and update freshness metadata without replacing identical media data.
The tempting but misleading response is treating the status as media corruption or redownloading unconditionally. That action does not test the distinction that matters here: this is a control result equivalent to successful revalidation, not a playback failure.
A controlled correction
- Capture
0xC00D13F1, the symbolic name, the exact API/administrative action and the first failure timestamp. - Preserve cached version validators, origin response status, expiration time, cache key and selected local object.
Changes that do not establish the cause
- treating the status as media corruption or redownloading unconditionally.
Technical references
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