debug1: match: OpenSSH_6.6.1p1 Ubuntu-2ubuntu2.10 pat OpenSSH_6.6.1* compat 0x04000002 debug1: Authenticating to <host>:22 as 'root' debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: algorithm: curve25519-sha256@libssh.org debug1: kex: host key ...