I'm seeing this same issue on Ubuntu 14.04 LTS using OpenSSH 1.0.1f.
mab@source:~$ ssh -v mtaxxx
OpenSSH_6.6.1, OpenSSL 1.0.1f 6 Jan 2014
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug1: Connecting to mtaxxx [ip address hidden] port 22.
debug1: Connection established.
debug1: identity file /home/mab/.ssh/id_rsa type -1
debug1: identity file /home/mab/.ssh/id_rsa-cert type -1
debug1: identity file /home/mab/.ssh/id_dsa type 2
debug1: identity file /home/mab/.ssh/id_dsa-cert type -1
debug1: identity file /home/mab/.ssh/id_ecdsa type -1
debug1: identity file /home/mab/.ssh/id_ecdsa-cert type -1
debug1: identity file /home/mab/.ssh/id_ed25519 type -1
debug1: identity file /home/mab/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.6.1p1 Ubuntu-2ubuntu2
debug1: Remote protocol version 2.0, remote software version OpenSSH_6.6.1p1
Ubuntu-2ubuntu2
debug1: match: OpenSSH_6.6.1p1 Ubuntu-2ubuntu2 pat OpenSSH_6.6.1* compat
0x0400
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server-client aes128-ctr hmac-md5-...@openssh.com none
debug1: kex: client-server aes128-ctr hmac-md5-...@openssh.com none
debug1: sending SSH2_MSG_KEX_ECDH_INIT
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
Connection closed by ip6 address
I can ping6 the host, see the traffic getting there in tcpdump, but SSH
won't connect (over v6).
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https://bugs.launchpad.net/bugs/281882
Title:
ssh hangs in initial handshaking when using IPv6
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