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WS_E_PROXY_REQUIRES_NTLM_AUTH
WS_E_PROXY_REQUIRES_NTLM_AUTH is a Windows Web Services API HRESULT. It means that the proxy rejected the offered authentication scheme and requires NTLM authentication.
What to check for WS_E_PROXY_REQUIRES_NTLM_AUTH
- Verify the proxy authentication policy, user context and NTLM availability for the client process.
- Check proxy host identity and connection behavior before enabling integrated credentials.
- Do not forward NTLM credentials through an unexpected proxy or an untrusted network path.
Diagnostic interpretation
This result has the HRESULT value 0x803D001A. AllStat records the condition as “The HTTP proxy server requires HTTP authentication scheme 'NTLM'.”.
Evidence to capture
- Capture any IErrorInfo text, activity identifier, event-log entry, and subsystem trace that mentions this result or the ws / proxy / requires / ntlm / auth operation.
- check the documented return contract of the specific API because the same HRESULT can require different recovery in different interfaces.
Retry and recovery
Preserve the failing evidence for WS_E_PROXY_REQUIRES_NTLM_AUTH before recovery. After changing the identified cause, repeat the same minimal operation and compare it with the original trace.
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