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Socketpair authentication fails while Proxifier is enabled #129676

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Socketpair authentication fails while Proxifier is enabled#129676
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stdlibPython modules in the Lib dirPython modules in the Lib dirtype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error
@mathiascode

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@mathiascode
mathiascode
opened on Feb 5, 2025
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Bug report

Bug description:

In the fallback socketpair implementation for Windows, socket authentication fails while Proxifier (and likely similar tools) are enabled. The following exception is always raised:

cpython/Lib/socket.py

Lines 644 to 648 in e41ec8e

if (
ssock.getsockname() != csock.getpeername()
or csock.getsockname() != ssock.getpeername()
):
raise ConnectionError("Unexpected peer connection")

Originally spotted in: nicotine-plus/nicotine-plus#3265

Relevant discussion on curl's issue tracker: curl/curl#10144

CPython versions tested on:

3.12

Operating systems tested on:

Windows

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    stdlibPython modules in the Lib dirPython modules in the Lib dirtype-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

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