HRESULT 0x80072F09 (WININET_E_MIXED

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Description:

WinINet detected mixed secure and non-secure connections.

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WININET_E_HTTPS_TO_HTTP_ON_REDIR	WININET_E_CHG_POST_IS_NON_SECURE

WININET_E_MIXED_SECURITY

WININET_E_MIXED_SECURITY is a WinINet HRESULT. It means that a secure context is attempting to load or combine content through both HTTPS and insecure HTTP connections. WinINet considers the combination a security concern.

What to check

Ensure that every endpoint and subresource needed for the operation uses HTTPS where the main workflow is secure.
Inspect redirects, embedded URLs and proxy rewriting for an unexpected downgrade to HTTP.
Do not disable mixed-content protections merely to hide the warning; update the insecure dependency instead.

Microsoft: WinINet overview

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