In libssh, if an provided hostname resolves to IPv6 and IPv4 addresses, the connection tries only the first one. Usually it tries IPv6 first and usually fails before trying the IPv4 address.
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The easiest way to reproduce this is to put something like this in /etc/hosts:
2001:db8::1 testing 192.168.0.1 testing
and then try to ./examples/ssh-client -vvvv testing. The client only tries the first address and gives up without trying the next.