https://www.cnblogs.com/y593216/p/11232703.html
应该是sshd的设置不允许root用户用密码远程登录
1、修改 vim /etc/ssh/sshd_config
找到# Authentication:
LoginGraceTime 120
PermitRootLogin without passwd
StrictModes yes
改成
# Authentication:
LoginGraceTime 120
PermitRootLogin yes
StrictModes yes
2、重启ssh
systemctl restart sshd
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