SSH exchange identification: Connection closed by remote host [Solved]

If you will face this problem when connecting through ssh:
SSH exchange identification: Connection closed by remote host.
Maybe your server was under a brute force attack. To solve this problem in an easy way you could install denyhosts. On Centos server yum install denyhosts. Edit /etc/hosts.allow and insert the IP that you never want to block. Edit /etc/denyhosts.conf and check your distribution default conf. After that, simply start denyhosts service denyshosts start Stay tuned.