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ssh エラーメッセージ「sshd: error: kex_exchange_identification: banner line contains invalid characters」が表示されるのはなぜですか?

Solution Unverified - Updated -

Issue

/var/log/secure に以下のメッセージが出力されます。

~~~
sshd[25150]: error: kex_exchange_identification: banner line contains invalid characters
~~~

Environment

  • Red Hat Enterprise Linux 8

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