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Date:      Fri, 10 Jun 2022 17:26:26 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 264600] sshd: Fssh_kex_exchange_identification: Connection closed by remote host errors
Message-ID:  <bug-264600-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D264600

            Bug ID: 264600
           Summary: sshd: Fssh_kex_exchange_identification: Connection
                    closed by remote host errors
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: jlduran@gmail.com

After upgrading a public-facing SSH server to OpenSSH 8.8 (13.1-RELEASE), it
has started spamming dmesg logs with:

    error: Fssh_kex_exchange_identification: Connection closed by remote ho=
st

To replicate it, just `nc ssh-server 22`.

Per conversation with @emaste, opening this PR to track it.

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