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为什么 ssh 连接被拒绝？

tag-icon • tag-icon linux networking ssh grep raspberry-pi
为什么 ssh 连接被拒绝？

如何设置 ssh 连接始终成功？我使用 ssh 与 Raspberry Pi 进行远程通信。大多数时候我都可以连接。但有时，我收到连接错误，如“会话已关闭”。有时，“连接被拒绝”。为什么我会遇到这些连接错误，我喜欢连接几乎 100%。现在我经常收到该错误。我搜索了一下，发现我需要检查我的sshd_config文件并运行ps -ax | grep ssh。我的ps -ax | grep ssh输出是

pi@raspberry ~ $ ps -ax | grep ssh
warning: bad ps syntax, perhaps a bogus '-'?
See http://gitorious.org/procps/procps/blobs/master/Documentation/FAQ
 2573 ?        Ss     0:00 /usr/bin/ssh-agent /usr/bin/dbus-launch --exit-with-session x-session-manager
 2930 ?        Ss     0:00 /usr/sbin/sshd
 3132 ?        Ss     0:00 sshd: pi [priv]  
 3136 ?        S      0:00 sshd: pi@notty   
 3251 ?        Ss     0:00 sshd: pi [priv]  
 3255 ?        S      0:00 sshd: pi         
 3262 ?        Ss     0:00 sshd: pi [priv]  
 3266 ?        S      0:00 sshd: pi@notty   
 3284 pts/1    S+     0:00 grep --color=auto ssh

我的 sshd_config 文件内容是

# 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 yes
PubkeyAuthentication yes
#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

您应该从日志文件中获得解决问题的指示。auth.log 或 syslog。

如果 sshd_config 中没有，请将“LogLevel”从“INFO”更改为“DEBUG”

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