ssh packet_write_wait Broken pipe

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ssh连接空闲一段时间后出现：

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packet_write_wait: Connection to UNKNOWN port 65535: Broken pipe

这是连接超时，需要设置一个保持心跳的参数，客户端是ServerAliveInterval，服务器端是ClientAliveInterval，参数值单位为second，还可以在.ssh/config中为每用户、每连接设置此参数

客户端：
/etc/ssh/ssh_config文件

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Host *
ServerAliveInterval 45

References:
[1]How to prevent “Write Failed: broken pipe” on SSH connection?
[2]当SSH遇到“Write failed: Broken pipe”