运行 Ubuntu 12.04
我可以使用任何用户（包括 root）通过 SSH 成功登录，但是每当我尝试通过 SFTP 进入服务器时，都会收到拒绝身份验证的信息。下面是客户端（winscp）上的错误，下面是“/var/log/auth.log”。值得注意的是，我也可以在本地通过 SFTP 进行登录。这不应该是防火墙问题，尤其是当端口扫描器显示服务器正在监听端口 22 时。
Authentication log (see session log for details):
Using username "test-user".
Authentication failed.
Apr 29 07:34:29 HOST_NAME sshd[3453]: Accepted password for test-user from X.X.X.X port 43592 ssh2
Apr 29 07:34:29 HOST_NAME sshd[3453]: pam_unix(sshd:session): session opened for user test-user by (uid=0)
Apr 29 07:34:31 HOST_NAME sshd[3564]: subsystem request for sftp by user test-user
Apr 29 07:34:48 HOST_NAME sshd[3453]: pam_unix(sshd:session): session closed for user test-user
不确定从哪里开始调试。我已经完全卸载了 OPENSSH-SERVER 并重新安装。如果需要进一步的详细信息，请告诉我（确切的命令可能会节省时间 =P）
编辑：/etc/ssh/sshd_config
# Package generated configuration file
# See the sshd_config(5) manpage for details
# What ports, IPs and protocols we listen for
Port 22
# Use these options to restrict which interfaces/protocols sshd will bind to
#ListenAddress ::
#ListenAddress 0.0.0.0
Protocol 2
# HostKeys for protocol version 2
HostKey /etc/ssh/ssh_host_rsa_key
HostKey /etc/ssh/ssh_host_dsa_key
HostKey /etc/ssh/ssh_host_ecdsa_key
#Privilege Separation is turned on for security
UsePrivilegeSeparation yes
# Lifetime and size of ephemeral version 1 server key
KeyRegenerationInterval 3600
ServerKeyBits 768
# Logging
SyslogFacility AUTH
LogLevel INFO
# Authentication:
LoginGraceTime 120
PermitRootLogin yes
StrictModes yes
RSAAuthentication no
PubkeyAuthentication no
#AuthorizedKeysFile %h/.ssh/authorized_keys
# Don't read the user's ~/.rhosts and ~/.shosts files
IgnoreRhosts yes
# For this to work you will also need host keys in /etc/ssh_known_hosts
RhostsRSAAuthentication no
# similar for protocol version 2
HostbasedAuthentication no
# Uncomment if you don't trust ~/.ssh/known_hosts for RhostsRSAAuthentication
#IgnoreUserKnownHosts yes
# To enable empty passwords, change to yes (NOT RECOMMENDED)
PermitEmptyPasswords no
# Change to yes to enable challenge-response passwords (beware issues with
# some PAM modules and threads)
ChallengeResponseAuthentication no
# Change to no to disable tunnelled clear text passwords
#PasswordAuthentication yes
# Kerberos options
#KerberosAuthentication no
#KerberosGetAFSToken no
#KerberosOrLocalPasswd yes
#KerberosTicketCleanup yes
# GSSAPI options
#GSSAPIAuthentication no
#GSSAPICleanupCredentials yes
X11Forwarding yes
X11DisplayOffset 10
PrintMotd no
PrintLastLog yes
TCPKeepAlive yes
#UseLogin no
#MaxStartups 10:30:60
#Banner /etc/issue.net
# Allow client to pass locale environment variables
AcceptEnv LANG LC_*
Subsystem sftp /usr/lib/openssh/sftp-server
# Set this to 'yes' to enable PAM authentication, account processing,
# and session processing. If this is enabled, PAM authentication will
# be allowed through the ChallengeResponseAuthentication and
# PasswordAuthentication. Depending on your PAM configuration,
# PAM authentication via ChallengeResponseAuthentication may bypass
# the setting of "PermitRootLogin without-password".
# If you just want the PAM account and session checks to run without
# PAM authentication, then enable this but set PasswordAuthentication
# and ChallengeResponseAuthentication to 'no'.
UsePAM yes
答案1
注释掉“AcceptEnv LANG LC_*”
答案2
如果这是 Red Hat/CentOS 服务器，则可能的原因可能是 SELinux。您可以使用
getenforce
命令并将其更改为禁用或允许作为临时解决方案。