I have two servers, one of them runs Ubuntu 14, another one runs 16.04.4. I'm trying to log in via ssh (Windows, Putty + Pageant) as a simple user, not as root. /etc/ssh/sshd_config files are identical on both machines, as well as ~/.ssh/authorized_keys and its permissions (700 to ~/.ssh, 600 to ~/.ssh/authorized_keys). Password authorization works ok.
Login to Ubuntu 14 works as charm, that to Ubuntu 16 doesn't. What could be the reason of this problem? Smth was changed in the policies in Ubuntu 16?