SSH Terminal error: root@::: Permission denied (password)

Symptoms

Plesk SSH Terminal extension login fails with error:

root@::: Permission denied (password)

Cause

Public key authentication is disabled in server. Terminal extension adds key to authorized_keys files.

Resolution

Set PubkeyAuthentication in /etc/ssh/sshd_config to yes

# cat /etc/ssh/sshd_config | grep Pubkey
PubkeyAuthentication yes