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Description of problem:
  gnutls-serv doesn't listen on IPv4/IPv6 loopback addresses in case there are no IPv4/IPv6 (resp.) external addresses configured.

Version-Release number of selected component (if applicable): gnutls-3.6.14-6.el8.x86_64
How reproducible: always

Steps to Reproduce (IPv6, same works for IPv4):
  1. `ip a del` all your IPv6 addresses
  2. gnutls-serv

Actual results:
  HTTP Server listening on IPv4 0.0.0.0 port 5556...done

Expected results:
  HTTP Server listening on IPv4 0.0.0.0 port 5556...done
  HTTP Server listening on IPv6 :: port 5556...done

Additional info:
  This is a downstream request for https://gitlab.com/gnutls/gnutls/-/issues/1007, which demonstrates the IPv4 case in the wild.
  IPv6 socket bound to `::` would've dual-stacked if not for the IPV6_V6ONLY.
  Personally, I like binding to `::` w/o IPV6_V6ONLY or the patch in https://gitlab.com/gnutls/gnutls/-/issues/1007#note_356637206.

bz1908036 is a sister bug for openssl (same issue, also caused by AI_ADDRCONFIG application).

Beniamino asked for a NetworkManager bug regarding the underlying issue, so I filed 1909213.

Fixed upstream in:
https://gitlab.com/gnutls/gnutls/-/merge_requests/1433

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Moderate: gnutls and nettle security, bug fix, and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2021:4451