Hi Jan, Thanks for your feedback. However, this list is not for reporting asyncio bugs. Please use the Python bug tracker to report issues in asyncio. bugs.python.org. --Guido On Sun, Feb 3, 2019 at 5:02 AM Jan Seeger <jan.seeger@thenybble.de> wrote:

Greetings!

I'm working with aiocoap, which uses the AI_V4MAPPED flag to use IPv4-mapped addresses for dual-stack support. When trying to run on Windows, creating a connection fails, because the socket option IPV6_V6ONLY is set to true per default on Windows, whereas the value is configurable on Linux. I've attached a file that should reproduce the error.

A possible fix would be calling socket.setsockopt(socket.IPPROTO_IPV6, socket.IPV6_V6ONLY, False) when V4-mapped addresses have been requested (this bug can also appear on Linux when /proc/sys/net/ipv6/bindv6only contains 1).

If you require any more information, feel free to contact me!

Best Regards,

Jan Seeger

PS: I am not a subscriber of this list, so please leave my address on any replies you send._______________________________________________ Async-sig mailing list Async-sig@python.org https://mail.python.org/mailman/listinfo/async-sig Code of Conduct: https://www.python.org/psf/codeofconduct/

-- --Guido van Rossum (python.org/~guido)