Re: [9fans] ssh handshake failed

["Brian L. Stuart" <blstuart@bellsouth.net>]

> trying to connect from 9atom via ssh (v2) to my linux machine I get:
>
> ssh: dial: handshake failed
>
> What should I check that might have gone wrong?
> (The machine is otherwise accessible from other systems via
> ssh.)

The first thing to check is whether the Linux box is configured to
do password auth or just "keyboard interactive" auth.  It seems
that OpenSSH these days defaults to having real password auth
turned off, but keyboard interactive turned on.  It's usually implemented
so that it looks the same to the end user, but the protocol is
different.  The SSHv2 implementation does not currently support
keyboard interactive.

Having said that, I seem to remember that the handshake failed
error actually occurs before you get to the auth stage.  It's very
early in the negotiation when the two sides exchange identities
and supported versions.  It's possible to run the tunnel with debugging
turned on and see what is being exchanged and what is being
complained about.  Similarly, you might look at logs on the Linux
side to see if there's something it's complaining about.

BLS