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SSH 连接始终丢失

tag-icon • tag-icon ubuntu ssh vps ubuntu-16.04
SSH 连接始终丢失

我在 VPS 中使用 Ubuntu 16.04 和 OpenSSH。每次我通过 ssh 登录时，最终都会断开连接。我无法输入任何内容。我需要关闭终端并再次打开它。但是，在尝试再次登录后，我总是收到一条消息ssh: connect to host xxx.xxx.xxx.xxx port 39904: Resource temporarily unavailable。之后我需要等待至少 2 分钟才能再次登录。

我真的不知道发生了什么。当我看到时/var/log/auth.log，有很多类似的条目：

May  1 19:41:21 vps20999 sshd[40006]: Received signal 15; terminating.
May  1 19:41:21 vps20999 sshd[40571]: Server listening on 0.0.0.0 port 39904.

指出我与 SSH 失去连接的确切时间。这是一台干净的机器。目前，它只有 OpenSSH 和 UFW。有人知道发生了什么吗？

我正在使用以下 SSH 配置：

# /etc/ssh/sshd_config
# SSH Configuration

# Connection Port
Port 39904

# Protocol Connection
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
HostKey /etc/ssh/ssh_host_ed25519_key

#Privilege Separation is turned on for security
UsePrivilegeSeparation yes

# Lifetime and size of ephemeral version 1 server key
KeyRegenerationInterval 3600
ServerKeyBits 1024

# Logging
SyslogFacility AUTH
LogLevel INFO

# Authentication
LoginGraceTime 120
PermitRootLogin no
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

# 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 no

X11Forwarding yes
X11DisplayOffset 10
PrintMotd no
PrintLastLog yes
TCPKeepAlive yes

MaxStartups 3:50:6
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 yes
# 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

# Access only IPv4
AddressFamily inet

# Groups and Users
AllowGroups sshdroplet sftponly
DenyUsers root
DenyGroups root

ClientAliveInterval 120
ClientAliveCountMax 150

答案1

$HOME/.ssh/config您可以在 SSH 客户端上使用 ServerAliveInterval 。

如果您没有在配置文件上进行配置，您可以运行以下命令：

echo "ServerAliveInterval 60" | tee -a ~/.ssh/config

（保持连接 60 秒）

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