hypervm adding ip to /etc/hosts.deny

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You may get this error while sshing to a ip
ssh_exchange_identification: Connection closed by remote host

It could be because of many reasons. One of them is hypervm adding the ips to /etc/hosts.deny file.
It will add the ip again if you remove it from /etc/hosts.deny.

The solution is after removing the ip, run this command

chattr +i /etc/hosts.deny