Problem

Cannot log in via ssh and get "ssh_exchange_identification: Connection closed by remote host".

Solution

The message is most often caused by too many failed login attempts from your IP address, resulting in your IP address being blacklisted.

Lodge a support request at the Pawsey support portal or help@pawsey.org.au stating:

which resource you cannot log in to (e.g. setonix.pawsey.org.au, data-mover.pawsey.org.au).
your username. Never email your password.
the time at which you last received the error.
the IP address you are trying to connect from (if you know it).

Blacklisting IP addresses after repeated failed logins is a security measure to prevent brute force attempts to gain access to our resources.