RHEL9: ssh'ing through a proxy fails with "kex_exchange_identification: Connection closed by remote host"

Solution Verified - Updated -

Issue

  • When configuring ssh with a proxy (HTTP, SOCKS, ...), the ssh session fails immediately before authentication, as shown in the example below

    $ 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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