[gnutls-devel] GnuTLS | Testsuite error - listening on IPv6, connecting to IPv4 (#1007)

[Development of GNU's TLS library]

Andreas Metzler created an issue: https://gitlab.com/gnutls/gnutls/-/issues/1007



## Description of problem:
My latest upload to Debian failed multiple tests:
https://buildd.debian.org/status/fetch.php?pkg=gnutls28&arch=amd64&ver=3.6.13-3&stamp=1590697920&raw=0

Afaict the errors all look like this:
~~~
FAIL: sni-hostname.sh
=====================

Checking SNI hostname in gnutls-cli
Echo Server listening on IPv6 :: port 9148...done
Could not connect to 127.0.0.1:9148: Connection refused
Failure: 1. handshake should have succeeded!
Exiting via signal 15
FAIL sni-hostname.sh (exit status: 1)
~~~

i.e. gnutls-serv somehow ends up listening only on IPv6 but the corresponding gnutls-cli command tries to connect to 127.0.0.1 (IPv4). I do not know why gnutls-serv does not listen on IPv4, too (perhaps the virtual host has no IPv4 interfaces), but afaiui the testsuite logic really is buggy in that respect.

## Version of gnutls used:
3.6.13

## Distributor of gnutls (e.g., Ubuntu, Fedora, RHEL)
Debian

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