System version：Linux centos7_server 3.10.0-693.el7.x86_64 #1 SMP Tue Aug 22 21:09:27 UTC 2017 x86_64 x86_64 x86_64 GNU/LinuxSystem version：Linux centos7_server 3.10.0-693.
阅读背景：
421 Service not available, remote server has closed connection，Vsftpd 账号登入自动断开连接
来源：互联网
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