Non-interactive SSH connection fails - error: can't open /dev/tty: No such device or address - Host key verification failed

Costin Caraivan
Fri Aug 24 14:33:00 GMT 2012

> '/var/log/sshd.log'.  But it will be empty if nothing noteworthy
> has occurred.  If you want to see more chatter, add a new service entry
> to run sshd with debug flags.  You can grab the details for how to set up
> a sshd service from '/bin/ssh-host-config' but the basics are:
> /usr/bin/cygrunsrv -I sshd_debug -d "CYGWIN Debug sshd" -p /usr/sbin/sshd -a
> "-D -d -d -d" -y tcpip -u cyg_server -w <your cyg_server password here>
> The three "-d" flags are the important part.  To start this service, use:
> /usr/bin/cygrunsrv -S sshd_debug
> This will need to be restarted with each connection attempt.  Also, you
> should stop your regular sshd service while running this so they don't
> conflict.
> /usr/bin/cygrunsrv -E sshd
> Apologies for typos.
> --
> Larry

Tried the debug launch, this is the log for a failed connection:
So it looks like the client is closing the connection (I think). It
seems it cannot find /dev/tty, even though it is there and it has the
rights to access it.

What I find very strange is that there's a different behavior from the
command line and when launched from an application. The command is
exactly the same :(
Costin Caraivan

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