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Re: ipv6 connect timeout

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From: Daniel Stenberg via curl-library <curl-library_at_lists.haxx.se>
Date: Fri, 22 Aug 2025 16:57:17 +0200 (CEST)

On Fri, 22 Aug 2025, Lars Sunde via curl-library wrote:

> We are running C++ software that uses libCurl 8.5 on Windows 10 and 11 that
> perform HTTP operations.
>
> During testing I notice a difference in some rare situations when running
> the software in Window 11 and in a virtual machine. The virtual machine is
> Oracle Virtual Box with Windows 11 host and Windows 10 guest OS).
>
> We enabled CURLOPT_VERBOSE to debug the issue when the software attempts to
> perform a HTTP post operation.

I suspect you are seeing Windows working as designed. I believe this is more
or less the same problem I blogged aobut last year:

https://daniel.haxx.se/blog/2024/08/14/slow-tcp-connect-on-windows/

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Received on 2025-08-22

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