[X2Go-User] updated x2go on my ubuntu 11.10 system and it now fails

brian mullan bmullan.mail at gmail.com
Tue Mar 6 01:52:38 CET 2012

On Mon, Mar 5, 2012 at 7:48 PM, brian mullan <bmullan.mail at gmail.com> wrote:

> I've had the flu and not been doing much until today when I finally got
> back to looking at this problem with ssh & x2go.
> I've found a very good explanation of the error I am receiving after
> upgrading my x2go client & servers.
> After entering my password in x2go client (ubuntu 11.10) and click OK I
> see... (*sorry for the prev. embedded .PNG crap) !*

The error message displayed to the x2go client user says:

> *Access denied. Authentication that can continue:
> publickey,keyboard-interactive*

So using google to search I found...

> This URL describes the issues with SSH that are involved:
> http://fixunix.com/ssh/73976-difference-between-password-keyboard-interactive.html
> in particular this seems like a very good explanation of the problem...
> although I haven't found out how to fix it ??
>  10-03-2007 04:12 AM  #3<http://fixunix.com/ssh/73976-difference-between-password-keyboard-interactive.html#post242273>
>   Re: Difference between password and keyboard-interactive
> In article <1168327274.938793.197960 at i15g2000cwa.googlegroups. com>
> "Gushi" writes:
> >I can't seem to find this anywhere.
> See RFC 4252 (http://www.ietf.org/rfc/rfc4252.txt) which describes (among
> other things) the mandatory password method, and RFC 4256
> (http://www.ietf.org/rfc/rfc4256.txt), which describes the optional
> keyboard-interactive method.
> >*What's the difference between password auth and keyboard-interactive?*
> >They'd seem to me to be the same thing, no?
> Essentially, in password the client sends username+password and gets a
> yes/no response from the server, *in keyboard-interactive* the client
> sends the username, and then gets prompted (possibly multiple times,
> possibly zero times) by the server for additional information, before a
> yes/no response is finally sent by the server.
> In the most common usage case, *keyboard-interactive *will prompt exactly
> once, for the user's password (well, it will typically re-prompt if the
> password is wrong:-), *which to the user looks essentially the same as
> password authentication* - the difference is mainly that in the password
> case, it is the client that prompts the user, while in
> keyboard-interactive, the client just relays the server's prompt (and
> relays the response back).
> However *keyboard-interactive* can thus support a variety of mechanisms
> besides single fixed password, e.g. challenge-response types where the
> server sends some random data, which the user feeds into a hardware token
> that generates a response for the user to type in. Being a perfect fit for
> PAM that is used on most current Unices, it allows for almost anything that
> you can plug into PAM to be used by ssh without any changes to the ssh code.
> *
> The password method on the other hand is a very bad fit for PAM, which is
> why for a while it wasn't possible to combine password and PAM in
> OpenSSH's sshd.* In current versions sshd "fakes" the interaction towards
> PAM, by internally supplying the password that it has already received when
> PAM tries to prompt the user for it.
> --Per Hedeland
> per at hedeland.org
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