ssh_exchange_identification error

From: Tom Syroid (tom@syroidmanor.com)
Date: 12/03/02

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    Date: Tue, 03 Dec 2002 12:12:58 -0600
From: Tom Syroid <tom@syroidmanor.com>
To: secureshell@securityfocus.com

    Greets all...

    OK, I'm stumped. I've worked with SSH for a lot of years, but I can't seem
    to get by this one.

    I'm responsible for administering a remote system 3,000 miles distant. No
    one at the office is the least bit "computer-wise". The system is a Dell
    PE4600 running RH 8.0. The only open port to the box is 22; on the other
    end is OpenSSH 3.51-p1.

    Friday everything was working swell. I logged in, did some maintenance
    stuff, logged out -- all without error or incident.

    This week when I try to log into the system, the command hangs for about
    five minutes (ssh <hostname>) then returns:

    ssh_exchange_identification: Connection closed by remote host

    I've tried from several different boxes; same result each time.

    I've had someone restart the daemon on the remote system (/etc/init.d/sshd
    restart). The task completed without error.

    Still no joy.

    WTF folks?? I've never seen this error message before. What direction
    should I be heading off in? I can't get into the box to check error logs, I
    can't get into the box to do anything. I've thought about asking someone to
    power cycle the system, but if restarting the daemon didn't fix the
    problem, am I gaining anything with a reboot?

    Any thoughts or ideas much appreciated.

    Best,
    /tom

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