为什么设置了SSH 密钥登录，在ubuntu的命令行下ssh没有密钥是登陆不了了，但是在windows下的putty却还可以用账号登陆，是我哪里设置错了么？？？

配置如下：（被注释掉的选项没列出来的）
Protocol 2

HostKey /etc/ssh/ssh_host_rsa_key
HostKey /etc/ssh/ssh_host_dsa_key
HostKey /etc/ssh/ssh_host_ecdsa_key
UsePrivilegeSeparation yes

KeyRegenerationInterval 3600
ServerKeyBits 768

SyslogFacility AUTH
LogLevel INFO

LoginGraceTime 120
PermitRootLogin no
StrictModes yes

RSAAuthentication yes
PubkeyAuthentication yes
AuthorizedKeysFile .ssh/authorized_keys

IgnoreRhosts yes
RhostsRSAAuthentication no
HostbasedAuthentication no



PermitEmptyPasswords no

ChallengeResponseAuthentication no


X11Forwarding yes
X11DisplayOffset 10
PrintMotd no
PrintLastLog yes
TCPKeepAlive yes


AcceptEnv LANG LC_*

Subsystem sftp /usr/lib/openssh/sftp-server


UsePAM yes

MaxAuthTries 3
PasswordAuthentication no