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RHEL9: プロキシー経由の ssh が "kex_exchange_identification: Connection closed by remote host" で失敗する

Solution In Progress - Updated -

Issue

  • ssh をプロキシー(HTTP、SOCKS など) で設定する場合、以下の例のように ssh セッションは、認証の直前に失敗します。

    $ ssh -o ProxyCommand="nc --proxy <proxy:8080> --proxy-type http %h %p" <user>@<remote-system> true
kex_exchange_identification: Connection closed by remote host
Connection closed by UNKNOWN port 65535

Environment

  • Red Hat Enterprise Linux 9
    • nmap-ncat

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