sshd: error: kex_exchange_identification: Connection closed by remote host

Solution Unverified - Updated -

Issue

  • The following messages appear frequently in /var/log/secure.

    Feb 19 20:01:10  sshd[806942]: error: kex_exchange_identification: Connection closed by remote host
Feb 19 20:01:14  sshd[806943]: error: kex_exchange_identification: Connection closed by remote host
Feb 19 20:01:15  sshd[806944]: error: kex_exchange_identification: Connection closed by remote host

Environment

  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9
  • openssh

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