服务器改了密码，试过密码多次后出现：
ssh_exchange_identification: read: Connection reset by peer
可以通过ssh -v查看连接时详情
OpenSSH_6.6.1, OpenSSL 1.0.1k-fips 8 Jan 2015
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 56: Applying options for *
debug1: Connecting to xxx [xx] port 22.
debug1: Connection established.
debug1: identity file /home/yanue/.ssh/id_rsa type -1
debug1: identity file /home/yanue/.ssh/id_rsa-cert type -1
debug1: identity file /home/yanue/.ssh/id_dsa type -1
debug1: identity file /home/yanue/.ssh/id_dsa-cert type -1
debug1: identity file /home/yanue/.ssh/id_ecdsa type -1
debug1: identity file /home/yanue/.ssh/id_ecdsa-cert type -1
debug1: identity file /home/yanue/.ssh/id_ed25519 type -1
debug1: identity file /home/yanue/.ssh/id_ed25519-cert type -1
........最后找打解决方法：
vi /etc/hosts.allow追加：
sshd: ALL重启ssh就ok了
service sshd restart
