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From: "Jason Pyeron" <jpyeron AT pdinc DOT us>
To: <cygwin AT cygwin DOT com>
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Subject: RE: [cygwin] ssh server immediately closing connection
Date: Wed, 2 Sep 2020 16:21:53 -0400
Organization: PD Inc
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> -----Original Message-----
> From: Leroy Tennison
> Sent: Wednesday, September 2, 2020 3:49 PM
> 
> Attempting to connect using blah AT 1 DOT 2 DOT 3 DOT 4 (the user and IP address have been obfuscated), the first
> time I'm prompted to accept the host's fingerprint and, after I do, the connection is immediately
> closed.  Trying again I get an immediate "Connection closed by 1.2.3.4 port 22".  I have tried both
> 32-bit and 64-bit Cygwin (after removing what was previously installed).  I used ssh-host-config and
> ssh-user-config for setup, the lines in sshd_config which aren't commented out are:
> 
> StrictModes no
> AuthorizedKeysFile      .ssh/authorized_keys
> Subsystem       sftp    /usr/sbin/sftp-server

Please detail the windows service configuration. I see that you are running as cyg_server account. Please try as SYSTEM.

Please confirm the issue is the same in the windows event log 

-Jason

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