On Thu, 25 Nov 2021, Dmitry Karpov via curl-library wrote:
IPv6 server1 <not responding> IPv6 server2 <not responding> IPv4 server1 <good>
It just struck me: did you mean "IPv6" vs "IPV4" here as servers that respond with A and AAAA records, or are they simply servers you access over IPv4 and IPv6 and they can both respond with any type of records?
Because if the latter, then it sounds like a c-ares bug, but in the earlier case I don't really see an easy solution other than for your application to somehow detect this and drop IPv6 use going forward.
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