| Previous | Next |
| NS_E_CACHE_CANNOT_BE_CACHED | NS_E_CANNOT_REMOVE_PUBLISHING_POINT |
NS_E_CACHE_NOT_MODIFIED
How to investigate 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 at an administrative or distribution checkpoint.
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 a this result trace, keep the cache key, origin validators and policy decision together. While diagnosing it, a cache proxy behaves both as a server to the player and as a client to the origin. The decisive question is whether the live object and values match that boundary; the base AllStat description alone does not reveal the object generation, selected plug-in or lower-level failure.
Evidence that separates this code
| Evidence | Why it matters for it |
|---|---|
| Decisive state | cached version validators, origin response status, expiration time, cache key and selected local object. |
| Owning object | Record the server, publishing point, playlist, namespace node, plug-in or cache item that returned this result, including its creation or restart time. |
| 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”. |
| Security-sensitive data | Log identifiers, lengths, hashes and redacted URLs where possible; do not publish passwords, authorization files or unrestricted client data. |
Related codes are different
Primary distinction: this is a control result equivalent to successful revalidation, not a playback failure.
| Nearby result | Different checkpoint |
|---|---|
NS_E_CACHE_ARCHIVE_CONFLICT | Compare its own symbolic boundary and the first failing call; it must not be grouped automatically with it. |
NS_E_CACHE_CANNOT_BE_CACHED | Relative to it, this neighboring result belongs to another state or validation branch even when the user-visible symptom is similar. |
NS_E_CACHE_ORIGIN_SERVER_NOT_FOUND | Use the object type and operation sequence to determine which result is authoritative. |
Code-specific failure anatomy
In a representative incident, the server reaches origin revalidation confirms that the cached representation is still current and rejects the operation before the caller can safely assume the next stage occurred. The incident record should therefore join cached version validators, origin response status, expiration time, cache key and selected local object with the object generation and the exact administrative or protocol request.
A useful negative control is serve the validated cached object and update freshness metadata without replacing identical media data. If that change advances the same it call, the result supports this boundary. If it remains, return to the first lower-level event instead of broadening the repair.
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. This distinction is also why monitoring should retain the symbolic name instead of storing only a generic COM failure.
A controlled correction
- Capture
0xC00D13F1, it, 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.
- confirm that the object still belongs to the current WMServer, publishing-point or presentation generation.
- Perform one isolated experiment: serve the validated cached object and update freshness metadata without replacing identical media data.
- Repeat the original the operation through the same protocol and service account; do not substitute a different client-side test.
- After it, verify the expected next state and retain any later HRESULT as a separate pipeline result.
Keep the post-fix server event and object status so a later downstream HRESULT is not mistaken for recurrence of this one.
Changes that do not establish the cause
- treating the status as media corruption or redownloading unconditionally.
- do not erase the first HRESULT by repeatedly clicking Apply; later calls can replace the thread error information and hide the component that rejected the operation.
- Do not suppress it or replace it with a generic “media server error”; retain the symbolic code and owning operation in telemetry.
Verification outcomes
| Retest observation | Interpretation |
|---|---|
| The same call still returns it | The rejected precondition has not changed, or the caller is still using an old object/configuration generation. |
| The operation advances and a later code appears | The boundary was cleared. After it, diagnose the new code at its own source, parser, sink, network or client stage. |
| A new object succeeds while the retained object fails | Object lifetime or stale context is part of the incident; update lifecycle handling rather than applying a machine-wide repair. |
| Only one publishing point, playlist, cache key or plug-in fails | The evidence favors object-specific configuration or content over a server-wide outage. |
Technical references
- Windows Media Server Cache Proxy Functionality
- Creating Cache Proxy Plug-ins
- Windows Media Services HTTP Proxy Server Interaction
- Microsoft HRESULT registry
Close the incident only after it clears on a current object.
Looking for a different code? Search another status or error code.