Hi Mike,
thanks for the confirmation and the submission.

If anyone is interested, one thing I did for now, to address this issue was to allow password-based access from my LAN addresses as described here: http://askubuntu.com/questions/101670/how-can-i-allow-ssh-password-authentication-from-only-certain-ip-addresses (Note that the match block should be at the end of sshd_config file as it affects all statements below it if I understand it correctly)

Use a Match block in /etc/ssh/sshd_config.

PasswordAuthentication no

Match address 192.0.2.0/24
    PasswordAuthentication yes

Best,
Matthias

On 27/8/2013 12:34 PM, Mike Gabriel wrote:

Package: x2goclient
Tags: confirmed
Version: 4.0.1.0
Severity: important
x-debbugs-cc: software@matthiaskauer.com

I myself have also observed the issue reported by Matthias. Adding this as a bug. This should get fixed before the release of 4.0.1.1.

Mike

----- Weitergeleitete Nachricht von software@matthiaskauer.com -----
     Datum: Mon, 26 Aug 2013 23:54:55 +0200
       Von: Matthias Kauer <software@matthiaskauer.com>
   Betreff: [X2Go-User] Login via ~/.ssh/authorized_keys fails
        An: x2go-user@lists.berlios.de

Hi,
I am looking for input on how to set up an ssh key-based authentication.

I generated an RSA key pair with puttygen and added it to
~/.ssh/authorized_keys2 => confirmed that I can login with putty.
Now, I specify the same private key in x2goclient (windows). I enter my
password and I am then prompted for the password of the ssh key. I enter
it and the same ssh key password prompt reappears. This seems to be an
infinite loop. When I cancel it, I get a message saying that only
publickey is supported as login method (which corresponds to my
sshd_config settings).

I then tried renaming ~/.ssh/authorized_keys and using a DSA key pair.
putty still works as expected with both of these alternatives.
x2goclient still shows the same problems however. It only lets me login
if I adapt my sshd_config and authenticate via user / password combination.

Is this a known limitation?
What is the best way to achieve high security? Can I limit the x2go
connections to only LAN IPs (without restricting the pure ssh connections)?

Best Wishes,
Matthias Kauer
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----- Ende der weitergeleiteten Nachricht -----