client_loop: send disconnect: Broken pipe mac Os

环境：
mac pro： big sur version: 11.2.3 M1

问题：
使用终端terminal 通过 ssh 登录云服务器，输入正确密码后，退出并报错：

client_loop: send disconnect: Broken pipe

但是使用secureCrt 可以成功登录远程服务器。

关于以上问题，网上有很多相关资料，大同小异。

解决方法：

该问题估计与默认的Big Sur OpenSSH 以及 LibreSSL 版本有关。
步骤：
1、安装openssh

brew install openssh

2、添加配置
打开 ~/.ssh/config，追加以下配置

vim ~/.ssh/config

配置内容

Host *

    IPQoS none
    TCPKeepAlive no
    ServerAliveInterval 60
    ServerAliveCountMax 5

保存然后退出。
再尝试 ssh 远程服务器，成功。

ssh -V

OpenSSH_8.1p1, LibreSSL 2.7.3

说明

1、 安装openssh 报错：Not a Valid Keg Error
处理

brew install nvm

2、 解释
2.1 ServerAliveCountMax： 断开时重试连接的次数
2.2 ServerAliveInterval： 每隔 n 秒自动发送一个空的请求以保持连接
2.3.TCPKeepAlive:

   Specifies whether the system should send TCP keepalive
         messages to the other side.  If they are sent, death of the
         connection or crash of one of the machines will be properly
         noticed.  However, this means that connections will die if
         the route is down temporarily, and some people find it
         annoying.
         The default is yes (to send TCP keepalive messages), and
         the client will notice if the network goes down or the
         remote host dies.  This is important in scripts, and many
         users want it too.
         To disable TCP keepalive messages, the value should be set
         to no.  See also ServerAliveInterval for protocol-level
         keepalives. 

2.4 IPQoS:

        Specifies the IPv4 type-of-service or DSCP class for
         connections.  Accepted values are af11, af12, af13, af21,
         af22, af23, af31, af32, af33, af41, af42, af43, cs0, cs1,
         cs2, cs3, cs4, cs5, cs6, cs7, ef, le, lowdelay, throughput,
         reliability, a numeric value, or none to use the operating
         system default.  This option may take one or two arguments,
         separated by whitespace.  If one argument is specified, it
         is used as the packet class unconditionally.  If two values
         are specified, the first is automatically selected for
         interactive sessions and the second for non-interactive
         sessions.  The default is af21 (Low-Latency Data) for
         interactive sessions and cs1 (Lower Effort) for non-
         interactive sessions.

参考：
rsync / git / ssh problem macos 11.3.1 / Big Sur
https://stackoverflow.com/questions/67522915/rsync-git-ssh-problem-macos-11-3-1-big-sur

https://man7.org/linux/man-pages/man5/ssh_config.5.html