What does HRESULT 0x80072F04 (WININET_E_HANDLE_EXISTS) mean?

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WININET_E_HANDLE_EXISTS means WinINet attempted to create or register a handle for a resource or operation that already has an existing handle.

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WININET_E_NEED_UI	WININET_E_SEC_CERT_DATE_INVALID

WININET_E_HANDLE_EXISTS

WININET_E_HANDLE_EXISTS is a WinINet HRESULT. It means that the application attempted to create or register a handle or handle-associated object that is already present in the current WinINet context.

What to check for WININET_E_HANDLE_EXISTS

Track handle ownership and avoid duplicate initialization for the same session or request object.
Close or reuse an existing handle according to the intended lifetime instead of creating another one.
Review concurrent startup paths for races that initialize the same network resource twice.

Microsoft: WinINet overview

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