May 4 00:04:35 sd-71796 sshd: fatal: no matching comp found: client zlib server none,[email protected] [preauth]
You need to install zlib and libgcrypt11-dev and set compression to yes on /etc/ssh/sshd_config.
sudo apt-get install libgcrypt11-dev zlib1g-dev
sudo nano /etc/ssh/sshd_config
And add Compression yes to it.
Save and restart ssh.
sudo service ssh restart
In some cases you might need to restart the server.