What does HRESULT 0xC00D1129 (NS_E_WINSOCK_ERROR_STRING) mean?

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Description:

Windows Media Player has encountered an unknown network error.%0

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NS_E_WMPIM_DIALUPFAILED	NS_E_WMPBR_NOLISTENER

NS_E_WINSOCK_ERROR_STRING

Diagnosing NS_E_WINSOCK_ERROR_STRING during Windows Media rights backup or connectivity

NS_E_WINSOCK_ERROR_STRING (0xC00D1129) is returned when the Player received a Winsock failure that was not mapped to a more specific Windows Media HRESULT.

Preserve one asynchronous operation record containing the selected path, event listener, network resource and license-store status. This result identifies a narrower stage than the dialog text exposes, so preserve its operation before trying a workaround. In this case the rejected checkpoint is the Player received a Winsock failure that was not mapped to a more specific Windows Media HRESULT.

Backup/restore boundary

AllStat already supplies the standard user-facing description for this HRESULT; this custom block instead isolates the additional technical boundary. Earlier success in file lookup, network connection, parser creation or graph construction does not prove that the later the operation is valid.

Case-specific checkpoint: the original WSA error, socket operation, local/remote endpoints, address family and timestamp. The controlled comparison for this HRESULT is: reproduce with Winsock tracing and preserve WSAGetLastError immediately after the failed operation.

Closest distinction: NS_E_WMP_NETWORK_ERROR is a higher Player-level summary and can hide this lower socket result.

Preserve the operation record

Capture	Why it matters for this HRESULT
Object or resource	the original WSA error, socket operation, local/remote endpoints, address family and timestamp
State snapshot	Record the Player openState/playState or operation phase, object identity and exact timestamp when this result was returned.
First lower result	Keep the earliest Win32, Winsock, COM, parser, codec, DRM or device result that appears before this result.
Comparison record	Use one known-good case that follows the same API, protocol and component path while changing only the rejected precondition.

Safe controlled retry

Freeze the current object state and collect the original WSA error, socket operation, local/remote endpoints, address family and timestamp.
Reproduce this result once without automatic retries or fallback applications.
Change only one precondition: reproduce with Winsock tracing and preserve WSAGetLastError immediately after the failed operation.
compare the first nested status and next Player event with the failed run.
After testing it, restore the original configuration if the change was diagnostic only.

Interpreting completion

Retest outcome	Interpretation
Same it on the same object	The governing state or value is unchanged, or the caller is reusing an object created before the relevant change.
Fresh object succeeds	Lifetime, cached configuration or stale playlist/graph state contributed to it.
A later HRESULT appears	The rejected condition — the Player received a Winsock failure that was not mapped to a more specific Windows Media HRESULT — was cleared for this HRESULT; diagnose the new code at its own layer.
Only one item or endpoint fails for this HRESULT	The evidence favors resource-specific data, rights, routing or device state rather than a global Player failure.

Actions that obscure the cause

diagnosing from the generic display string without the numeric WSA code.
Do not discard the first occurrence by repeatedly invoking Play, open, save or retry; later events can replace its original state.
do not publish credentials, private URLs, license material or complete protected-content headers; retain only redacted identifiers, lengths, hashes and protocol fields.

Technical references

After it, a different downstream HRESULT is progress and should be recorded as a separate condition.

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