SSH 登录时出现如下错误：ssh_exchange_identification: read: Connection reset by peer
原因：/etc/hosts.allow文件中禁用了所要连接的网段。/etc/hosts.allow文件内容如下：
# either use the tcp_wrappers library or that have been
# started through a tcp_wrappers-enabled xinetd.
#
# See 'man 5 hosts_options' and 'man 5 hosts_access'
# for information on rule syntax.
# See 'man tcpd' for information on tcp_wrappers
#
#sshd:192.168.0.111:allow //允许IP 192.168.0.111 登录
#sshd:192.168.0.*:allow //允许IP 192.168.0. 网段登录
#sshd:all:deny //禁止其他的所有IP登录
sshd:192.168.1.*:allow
sshd:all:deny
在文件中添加你要访问的网段(2)即可，如下：
sshd:192.168.2.*:allow
