Quite often the connection fails. Retrying the connections usually succeeds.
Both machines are running tumbleweed.

scarabeus@arcarius: ~ $ ssh -v bugaboo
OpenSSH_6.6.1, OpenSSL 1.0.2e-fips 3 Dec 2015
debug1: Reading configuration data /home/scarabeus/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 20: Applying options for *
debug1: Connecting to bugaboo [10.100.12.39] port 22.
debug1: Connection established.
debug1: identity file /home/scarabeus/.ssh/id_rsa type 1
debug1: identity file /home/scarabeus/.ssh/id_rsa-cert type -1
debug1: identity file /home/scarabeus/.ssh/id_dsa type 2
debug1: identity file /home/scarabeus/.ssh/id_dsa-cert type -1
debug1: identity file /home/scarabeus/.ssh/id_ecdsa type 3
debug1: identity file /home/scarabeus/.ssh/id_ecdsa-cert type -1
debug1: identity file /home/scarabeus/.ssh/id_ed25519 type -1
debug1: identity file /home/scarabeus/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.6.1
ssh_exchange_identification: read: Connection reset by peer
scarabeus@arcarius: ~ $ ssh -v bugaboo
OpenSSH_6.6.1, OpenSSL 1.0.2e-fips 3 Dec 2015
debug1: Reading configuration data /home/scarabeus/.ssh/config
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 20: Applying options for *
debug1: Connecting to bugaboo [10.100.12.39] port 22.
debug1: Connection established.
debug1: identity file /home/scarabeus/.ssh/id_rsa type 1
debug1: identity file /home/scarabeus/.ssh/id_rsa-cert type -1
debug1: identity file /home/scarabeus/.ssh/id_dsa type 2
debug1: identity file /home/scarabeus/.ssh/id_dsa-cert type -1
debug1: identity file /home/scarabeus/.ssh/id_ecdsa type 3
debug1: identity file /home/scarabeus/.ssh/id_ecdsa-cert type -1
debug1: identity file /home/scarabeus/.ssh/id_ed25519 type -1
debug1: identity file /home/scarabeus/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.6.1
debug1: Remote protocol version 2.0, remote software version OpenSSH_6.6.1
debug1: match: OpenSSH_6.6.1 pat OpenSSH_6.6.1* compat 0x04000000
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr hmac-md5-etm@openssh.com none
debug1: kex: client->server aes128-ctr hmac-md5-etm@openssh.com none
debug1: sending SSH2_MSG_KEX_ECDH_INIT
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ECDSA dd:28:0a:3c:1e:ea:7e:24:ce:62:77:30:d6:44:85:13
[MD5]
debug1: Host 'bugaboo' is known and matches the ECDSA host key.
debug1: Found key in /home/scarabeus/.ssh/known_hosts:34
debug1: ssh_ecdsa_verify: signature correct
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,keyboard-interactive
debug1: Next authentication method: publickey
debug1: Offering RSA public key: /home/scarabeus/.ssh/id_rsa
debug1: Server accepts key: pkalg ssh-rsa blen 277
debug1: Authentication succeeded (publickey).
Authenticated to bugaboo ([10.100.12.39]:22).
debug1: channel 0: new [client-session]
debug1: Requesting no-more-sessions@openssh.com
debug1: Entering interactive session.
debug1: Sending environment.
debug1: Sending env LANG = cs_CZ.UTF-8
debug1: Sending env LC_CTYPE = cs_CZ.UTF-8
Last login: Thu Feb 11 19:23:35 2016 from tchvatal.openvpn.suse.cz
Have a lot of fun...