我正在尝试第一次连接到 SSH。但它说
The authenticity of host '[<host>]:<port>' can't be established.
ECDSA key fingerprint is SHA256:xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx.
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added '[<host>]:<port>' (ECDSA) to the list of known hosts.
root@<host>: Permission denied (publickey).
是不是有违章之类的?