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WS_E_SERVER_REQUIRES_NEGOTIATE_AUTH
WS_E_SERVER_REQUIRES_NEGOTIATE_AUTH is a Windows Web Services API HRESULT. It means that the remote endpoint rejected the offered authentication scheme and requires HTTP Negotiate authentication, which can use Kerberos or NTLM.
What to check for WS_E_SERVER_REQUIRES_NEGOTIATE_AUTH
- Verify endpoint SPNs, DNS names, domain trust and ticket availability for the client identity.
- Confirm that the endpoint is trusted and matches the intended service principal.
- Use authentication diagnostics to identify whether Kerberos or NTLM was selected and why.
Diagnostic discriminator: Confirm that the endpoint is reachable and that its challenge selects Negotiate. Then inspect SPN, DNS and ticket state to distinguish Kerberos configuration from NTLM fallback rather than treating the result as transport failure.
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