我有两台电脑：PC1 和 PC2。两者都运行相同的 Debian Wheezy 安装和最新更新。PC2 上的安装是使用tar. PC1 和 PC2 之间的唯一区别是 grub 条目、主机名、内容/etc/hosts和 IP 地址。两台计算机的 SSHD 配置相同：
# 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 …