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RTC_E_SIP_AUTH_HEADER_SENT
Protocol boundary: RTC_E_SIP_AUTH_HEADER_SENT
Diagnosis begins inside selecting an allowed authentication method, validating the challenge realm, and establishing a protected SIP transport, where the decisive condition for this HRESULT is the RTC authentication state already sent authorization for this challenge path and will not repeat it blindly.
The numeric form of this result is 0x80EE000F in the RTC interface facility 0xEE; an exception translator handling it should preserve this value before converting it into application-facing call or presence states.
The quickest way to localize this result is to compare realm, nonce, method, CSeq, stale indication, and the previous Authorization attempt; the important the boundary is that this guards against an authentication loop rather than proving that credentials are valid.
Protocol and object boundary
| RTC area | SIP authentication and TLS identity boundary |
|---|---|
| Objects to correlate | profile authentication method, challenge headers, realm, credential source, TLS certificate and tunnel |
| Condition to prove | the RTC authentication state already sent authorization for this challenge path and will not repeat it blindly |
| Safe corrective direction | refresh challenge state or surface authentication failure instead of resending the same header indefinitely |
Two RTC rules frame this result: first, RTC profile rules tie some authentication methods to TCP or TLS; Basic authentication requires TLS in the legacy API contract; second, for this HRESULT, A certificate failure, a challenge mismatch, and invalid credentials occur at different layers and need different remediation.
How to prove the condition
- Record this result and
0x80EE000Fat the first RTC method or event that returns it. - Identify the client, profile, session, participant, presence object, terminal, or port manager that owns this it occurrence.
- Place it in its exact phase: parsing, discovery, transport, authentication, profile validation, dialog control, media, roaming, registration, redirection, or final response handling.
- prove the condition by ensuring the trace can compare realm, nonce, method, CSeq, stale indication, and the previous Authorization attempt.
- Apply one controlled change for this HRESULT: refresh challenge state or surface authentication failure instead of resending the same header indefinitely; then verify the result return value and resulting RTC state.
Use RTC event state to interpret the protocol trace for this HRESULT, and use the trace to verify what left or reached the host; for this HRESULT, this two-sided correlation identifies the producing layer.
Nearby failure modes
It should not be grouped with every value from the same facility. It is tied to the condition “the RTC authentication state already sent authorization for this challenge path and will not repeat it blindly”; preserve that producing boundary before choosing recovery; the result table shows nearby alternatives.
RTC_E_SIP_AUTH_FAILED | the selected SIP authentication attempt was rejected or could not validate for the challenge |
|---|---|
RTC_E_SIP_AUTH_TIME_SKEW | SIP authentication validation failed because client and server time differ beyond the accepted window |
RTC_E_SIP_INVALID_CERTIFICATE | the certificate presented or selected for SIP TLS does not satisfy RTC validation requirements |
Keeping it separate from these neighbors improves both user messaging and automated retry policy.
Minimum incident record
Correlate it at source: the method or callback, the owning object generation, and the active protocol transition; for this HRESULT, this keeps later retries from obscuring causality.
- Code-specific proof for this HRESULT: compare realm, nonce, method, CSeq, stale indication, and the previous Authorization attempt.
- Owning object for this HRESULT: certificate subject and validation failure.
- Wire evidence for this HRESULT: client/server UTC time and
TLSphase. - Lifecycle generation for this HRESULT: 401 or 407 challenge source.
Sanitize the result evidence before storage: secrets and user content should disappear, while framing, domains, sizes, hashes, timing, and object-state changes remain available for reproduction.
Correct application response
Recovery from it should be narrow: refresh challenge state or surface authentication failure instead of resending the same header indefinitely; while handling it, do not let a higher layer simultaneously recreate the same session, registration, listener, or profile.
Before retrying it, classify the previous operation as definitely failed, definitely completed, or remotely uncertain; for this HRESULT, that distinction prevents duplicate dialogs, bindings, transfers, or roaming mutations.
Example for this HRESULT: A proxy repeats the same Digest challenge after the client has already answered it.
Actions that do not address this condition
- An investigation should not never record Authorization header contents or plaintext passwords.
- Another non-solution for this HRESULT is to do not disable certificate checking or lower transport security to make authentication appear successful.
- Keep it intact through exception and UI layers; a generic parameter or network message is insufficient for diagnosis.
Verification after a fix
A useful it regression does more than expect an exception; the result test constructs “the RTC authentication state already sent authorization for this challenge path and will not repeat it blindly”, checks the exact HRESULT at the producing RTC boundary, and verifies state ownership before and after the targeted correction.
Technical references
- Microsoft profile creation rules — authoritative context for the boundary.
- Microsoft RTC return constants — definitions relevant when reproducing it.
- SIP authentication and TLS — API or protocol rules used to interpret it.
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