ssh to a vagrant libvirt forked machine while UP if failing ( https://gist.github.com/ribamar-santarosa/7b98edacaada8fc1892140a2aabca0e1 )

ssh-v-v-v-output

OpenSSH_7.4p1 Debian-10+deb9u1, OpenSSL 1.0.2l  25 May 2017
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug2: resolving "192.168.121.65" port 22
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to 192.168.121.65 [192.168.121.65] port 22.
debug1: Connection established.
debug1: key_load_public: No such file or directory
debug1: identity file /home/ribamar/.ssh/id_rsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/ribamar/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/ribamar/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/ribamar/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/ribamar/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/ribamar/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/ribamar/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/ribamar/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.4p1 Debian-10+deb9u1
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.4p1 Debian-10+deb9u1
debug1: match: OpenSSH_7.4p1 Debian-10+deb9u1 pat OpenSSH* compat 0x04000000
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to 192.168.121.65:22 as 'root'
debug3: hostkeys_foreach: reading file "/home/ribamar/.ssh/known_hosts"
debug3: send packet: type 20
debug1: SSH2_MSG_KEXINIT sent
Connection reset by 192.168.121.65 port 22