What does HRESULT 0x80072EE1 (WININET_E_OUT_OF_HANDLES) mean?

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WinINet could not allocate another Internet handle.

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E_PROP_SET_UNSUPPORTED	WININET_E_TIMEOUT

WININET_E_OUT_OF_HANDLES

WININET_E_OUT_OF_HANDLES is a WinINet HRESULT. It means that WinINet has no available handle for the requested operation. This commonly indicates that the application is retaining session, connection, request, cache, or URL handles longer than intended, or is creating more concurrent operations than the process can support.

What to check

Pair every successful WinINet handle creation with InternetCloseHandle on every completion and error path.
Inspect handle ownership and concurrent request limits; do not create a new session or connection for each small operation when reuse is appropriate.
Check process handle and memory usage to distinguish a WinINet leak from broader resource exhaustion.

Microsoft: WinINet overview

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