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[maksis <1245179@xxxxxxxxxxxxxxxxxx>]

.... my bad, even clearing the error wouldn't work, as one of the later
attempts may still set it (I've already forgotten what I was thinking
when I made that fix...). That fix is part of the latest stable versions
of AirDC++ and AirDC++ nano so I consider it to be reliable. The version
URL used by AirDC++ has A and AAAA records which makes noticing such
errors easy (even though I missed this bug first because I have IPv6
connectivity on every Linux machine...).

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https://bugs.launchpad.net/bugs/1245179

Title:
  Resolving addresses with A and AAAA entries may fail in some cases

Status in DC++:
  New

Bug description:
  Consider the following case:

  1. The client tries to connect to an address that has both A and AAAA entries
  2. ::getaddrinfo returns the AAAA entry first
  3. The client tries to connect via IPv6 but there's no IPv6 connectivity available (or it doesn't work for other reasons)
  4. Socket::connect throws immediately instead of continuing with the A entry

  I haven't seen this happening on Windows because it doesn't seem to
  return the AAAA entry if there is no (public) IPv6 connectivity
  available. However, Linux systems seem to generally return the AAAA
  first by default, regardless of the available connectivity. The
  attached patch should fix this issue.

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