The server changed the password. After trying the password for many times, it appears:

ssh_exchange_identification: read: Connection reset by peer

You can view the connection details through SSH – V

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 ........

Finally, find the solution:

vi /etc/hosts.allow

Add:

sshd: ALL

Restart SSH and it’s OK

service sshd restart