After upgraded to 2.0 one of my server become UNREACHABLE

[Jarod Liu]

$ ansible 'kk-fj0' -m ping -vvv
Using /home/jarod/workspace/ansible/ansible.cfg as config file
<kk-fj0.myhost.com> ESTABLISH SSH CONNECTION FOR USER: root
<kk-fj0.myhost.com> SSH: EXEC ssh -C -q -o ForwardAgent=yes -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o User=root -o ConnectTimeout=6 -tt kk-fj0.myhost.com 'mkdir -p "$( echo $HOME/.ansible/tmp/ansible-tmp-1453428339.66-115542581766412 )" && echo "$( echo $HOME/.ansible/tmp/ansible-tmp-1453428339.66-115542581766412 )"'
<kk-fj0.myhost.com> PUT /tmp/tmpKETvqJ TO /root/.ansible/tmp/ansible-tmp-1453428339.66-115542581766412/ping
<kk-fj0.myhost.com> SSH: EXEC sftp -b - -C -o ForwardAgent=yes -o KbdInteractiveAuthentication=no -o PreferredAuthentications=gssapi-with-mic,gssapi-keyex,hostbased,publickey -o PasswordAuthentication=no -o User=root -o ConnectTimeout=6 '[kk-fj0.myhost.com]'
kk-fj0 | UNREACHABLE! => {
    "changed": false,
    "msg": "ERROR! SSH Error: data could not be sent to the remote host. Make sure this host can be reached over ssh",
    "unreachable": true
}

This server can access from ansible 1.9 or ssh command. 

The rest of my servers can access from ansible 2.0, just this one can't.

Anyone know what's the problem?