sftp 和 ssh 连接间歇性失败，并显示错误 ssh_exchange_identification ：Connection closed by remote host
Issue
-
我们间歇性地无法 ssh 到服务器。以下错误显示：
# ssh server.example.com ssh_exchange_identification: Connection closed by remote host
Environment
- Red Hat Enterprise Linux 4
- Red Hat Enterprise Linux 5
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- openssh
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