On 2019-06-01 19:15:28 +0200, Markus Elfring wrote:
> >> connect(3, {sa_family=AF_INET, sin_port=htons(37351),
> >> sin_addr=inet_addr("127.0.0.1")}, 16) = -1 ECONNREFUSED (Connection
> >> refused)
> > Without seeing the code, I'd be suspicious of that difference.
>
> I would expect that the IPv4 address from such a connection attempt
> would be automatically converted to a IPv6 loopback address.
You haven't said which OS you are using, but as far as I know this
expectation will be frustrated at least on Linux: There ::1 and
127.0.0.1 are distinct addresses. If you want to accept connections on
both, you have to listen on both (or on ::, which does accept
connections on all IP addresees - IPv6 and IPv4).
hp
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