| Previous | Next |
| NS_E_CURL_INVALIDCHAR | NS_E_CURL_INVALIDPATH |
NS_E_CURL_INVALIDHOSTNAME
Diagnosing NS_E_CURL_INVALIDHOSTNAME in the Windows Media pipeline
This result (0xC00D1326) is returned at the authority contains a host representation rejected by the URL parser. It identifies the invalidhostname URL check, so troubleshooting should begin with the object and operation that own that checkpoint rather than with a broad player reset.
Before any socket is opened, the player decomposes a URL into scheme, authority, host, port, path and escaped data at the invalidhostname checkpoint. It may also combine a relative reference with a base URL or convert a file URL into a path; each operation has a different validity rule while tracing the invalidhostname path. In the case of this result, preserve the earliest lower-level result because wrappers can map several different causes to the same HRESULT during a controlled invalidhostname retest.
Where the failure occurs
At the invalidhostname URL check, the component has already accepted the earlier prerequisites but cannot cross the boundary described as the authority contains a host representation rejected by the URL parser. That distinction matters: success in opening the file, resolving the host or creating a COM object does not prove that this later operation is valid before closing the invalidhostname incident.
The strongest reproduction is test the same scheme and path with a known-valid DNS name, then separately validate IDNA or IP-literal formatting of the original host in the invalidhostname diagnostic record. If the same call advances after that single change, the evidence supports the boundary. If it does not, return to the first nested error rather than widening the repair at the invalidhostname checkpoint.
Preserve the raw and parsed URL
| Capture | Why it matters |
|---|---|
| Owning call | Record the API method, object identity, thread or callback and timestamp for the invalidhostname URL check. |
| Decisive values | the original unmodified string, character count, encoding, base URL if any, parsed scheme, host, port and path, plus required and supplied output-buffer lengths during a controlled invalidhostname retest. |
| Object generation | Note when the reader, writer, graph, URL object, streaming session or metadata provider was created; stale state can reproduce this result after configuration has changed. |
| First nested result | Keep the earliest codec, COM, socket, DNS, parser or provider status before this result; later UI messages are less specific. |
| Comparison case | Use one known-good resource that exercises the same the invalidhostname URL check while changing only the rejected precondition. |
One-component URL experiment
- Log
0xC00D1326, it, the exact operation and the first failure time when isolating the invalidhostname case. - Preserve the original unmodified string, character count, encoding, base URL if any, parsed scheme, host, port and path, plus required and supplied output-buffer lengths at the invalidhostname checkpoint.
- Do not reuse a graph, session, reader or metadata object created before the relevant configuration or resource changed while tracing the invalidhostname path.
- Perform one isolated test: test the same scheme and path with a known-valid DNS name, then separately validate IDNA or IP-literal formatting of the original host during a controlled invalidhostname retest.
- Repeat through the same API and protocol path; a different player or local-copy test is useful only as a comparison, not as proof that the invalidhostname URL check is fixed.
- Confirm the expected next state and retain any new HRESULT as a separate downstream result before closing the invalidhostname incident.
What the parser result proves
| Retest result | Interpretation |
|---|---|
| The identical call still returns the code | The values governing the invalidhostname URL check are unchanged, or the caller is still using an older object generation. |
| A fresh object succeeds | Lifetime or cached state contributed to it; correct object recreation instead of applying a machine-wide workaround when isolating the invalidhostname case. |
| The call advances to another HRESULT | the invalidhostname URL check boundary was cleared. Diagnose the new code at its own format, graph, URL, network or metadata stage while tracing the invalidhostname path. |
| Only one resource fails | The evidence favors content, URL, publishing point, stream, attribute or object-specific state rather than a global outage during a controlled invalidhostname retest. |
Nearby results are not interchangeable
Main distinction: host validation concerns the authority component; DNS timeout occurs later, after a syntactically accepted host is queried for evidence about invalidhostname.
| Nearby HRESULT | How to compare it |
|---|---|
NS_E_CURL_NOTSAFE | Compare the owning API and first rejected value; it belongs to a neighboring checkpoint, not automatically to the same cause as it. |
NS_E_CURL_INVALIDCHAR | Use object state and operation order to decide which code is authoritative when both appear in one trace in the invalidhostname diagnostic record. |
NS_E_CURL_INVALIDPATH | Retain it separately if it appears only after the condition has cleared. |
Misleading actions
- blindly decoding and re-encoding the whole URL, which can change reserved delimiters and resource identity at the invalidhostname checkpoint.
- Do not erase the first occurrence by repeatedly retrying; callbacks and reconnects can replace the useful state with a later wrapper error while tracing the invalidhostname path.
- Do not publish credentials, protected-content material or complete private URLs during a controlled invalidhostname retest. Record redacted identifiers, lengths, hashes and protocol fields needed to reproduce the invalidhostname URL check.
Technical references
- RFC 3986: URI generic syntax
- Handling URLs with WinINet
- CreateUri
- ParseURL
- Microsoft HRESULT registry
Close the incident only after the original the operation succeeds on a current object and the expected next state is observed before closing the invalidhostname incident.
Looking for a different code? Search another status or error code.