sudo nano /etc/ssh/ssh_config

Comment out the following lines

#GSSAPIAuthentication yes
#GSSAPIDelegateCredentials no

OR

sudo nano /etc/ssh/sshd_config

UseDNS no
UsePAM no # (Pluggable Authentication Modules)
PasswordAuthentication no # Heckers slow down the shits and create huge logs with continous bruteforce.

 

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