What does HRESULT 0x80190197 (HTTP_E_STATUS_PROXY_AUTH_REQ) mean?

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Description:

The proxy returned HTTP 407 Proxy Authentication Required.

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HTTP_E_STATUS_NONE_ACCEPTABLE	HTTP_E_STATUS_REQUEST_TIMEOUT

HTTP_E_STATUS_PROXY_AUTH_REQ

HTTP_E_STATUS_PROXY_AUTH_REQ maps to HTTP 407 Proxy Authentication Required. The request reached an intermediary proxy, but the proxy needs credentials before it will forward the request.

What to check

Inspect the Proxy-Authenticate challenge and configure the proxy credentials in the client context that actually performs the request.
Verify the distinction between application proxy settings, system proxy settings, and service-account proxy settings.
Review proxy logs for the rejected identity and authentication scheme; do not send origin-server credentials as proxy credentials.

RFC 9110: 407 Proxy Authentication Required

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