ssh_exchange_identification: Connection closed by remote host

When looking to join by way of ssh to a server, If you get this answer from the server.

ssh_exchange_identification: Connection closed by remote host

If this happens to you too, first start looking if you are using this format to log in the server

ssh -l [existing-server-user ] [ip-of-the-server]

or

ssh [existing-server-user]@[ip-of-the-server]

Then, and here it was my problem, be sure you have correctly set your

/etc/hosts.allow
and
/etc/hosts.deny

mine was

hosts.allow

#
# /etc/hosts.allow
#
# End of file

which was O.K.

hosts.deny

#
# /etc/hosts.deny
#
ALL: ALL: DENY
# End of file

Use this only as your last resort, and only if you also have a firewall protecting your server, this is dangerous to apply, and if you do, try to go back to the previous (default) configuration as soon as possible.

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