SSH的反向DNS解析会消耗大量时间
打开sshd服务的配置文件/etc/ssh/sshd_config,把UseDNS yes改为UseDNS no
vi /etc/ssh/sshd_config
重启sshd服务
/etc/init.d/sshd restart
修改vsftpd.conf,添加下面一句
reverse_lookup_enable=NO
关闭GSS认证
找到 GSSAPIAuthentication yes
改为 GSSAPIAuthentication no
Esc后输入:冒号,然后打x!

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