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scp foo.txt user1@192.168.23.130:. can succeed, while scp foo.txt root@192.168.23.130:. always fail, after I input the correct root password as scp requires, it always say: Permission denied, please try again

Why is that? Ubuntu 20.04 LTS server version, with FinalShell3.8.3

another question which may have something common, which is also related with the root user:

Why ssh client always say access denied when I ssh a remote machine with root? I tried with different ssh clients and the results are the same.

ZhaoGang
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    In Ubuntu, root account is disabled for good reasons. You don't need it. Login as normal user and run sudo su - to become root. However, if you still want to enable it, see the linked question: How to enable root login? – pLumo Feb 09 '21 at 08:22

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Probably because of #PermitRootLogin prohibit-password (or similar) in your /etc/ssh/sshd_config. Uncomment this line, change it to PermitRootLogin yes and reload sshd. Please note, that this is not recommended!

BulletBob
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