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my ssh has started to refuse users from out of the blue. I started to connect via Putty as root, me and other users.

login as: root
root@31.XX.XX.XXX's password:
Access denied

What could be wrong? I didn't change anything.

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Could you check your server logs ? You will find a more interesting information for debuging your problem – Dom Jan 4 at 8:41
Can you post the output of ssh -v server_ip? – Khaled Jan 4 at 8:47
Thank you guys for the advices. I find out, that the root isn't in allowed groups. So, solved by editing /etc/ssh/sshd_config! – Ginnyous Jan 4 at 9:02
2  
@Ginnyous Be careful with root login enabled - it's one less barrier for an attacker to overcome. – Shane Madden Jan 4 at 22:39
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