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从 rhel6 到 rhel8 的 SSH 连接失败并显示消息 'Unable to negotiate a key exchange method'

Solution In Progress - Updated -

Issue

  • 在从 RHEL6 到 RHEL8 服务器的 ssh 连接过程中，在详细输出中得到以下内容：-
debug2: mac_setup: found hmac-sha1
debug1: kex: server->client aes128-ctr hmac-sha1 none
debug2: mac_setup: found hmac-sha1
debug1: kex: client->server aes128-ctr hmac-sha1 none
Unable to negotiate a key exchange method
  • 观察到以上消息，即使 FIPS 未启用。

Environment

  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 6
  • openssh

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