[X2Go-Dev] X2go Mac client and Red Hat 7 server

[Stefan Baur]

Am 21.05.2015 um 01:07 schrieb Mihai Moldovan:
> On 20.05.2015 11:34 PM, Real, Elizabeth (392K) wrote:
>> What version of SSH does x2go use?
> 
> X2Go uses SSH version 2. Protocol version 1 should not be in use
> anymore.

Maybe the question is more like openssh vs. libssh vs. libssh2.

X2GoClient uses libssh.

[...]

> It *could* also be a bug in libssh, but that would be very odd.
> Especially given it works for other people.

We're seeing a different type of connection problem - the initial
connect phase taking about 3 minutes with X2GoClient, but not with
regular SSH - with another user.

This particular user is using a tool that allows to log in to a Linux
server using Credentials from a Windows Active Directory.

@Liz: Are you, by any chance, using some non-standard login mechanism,
a PAM module for Active Directory Sync or something like that?

We will debug this other user's issue by testing the connection with a
small, custom-built SSH client that uses libssh, just like X2GoClient
does.  Maybe that would be worth a try in your case, too.

Since you probably can't just let some random Joe from the internet
connect to a NASA/JPL-owned X2Go Server, how about we turn things
around?  I could try to set up a CentOS 7.0 or 7.1 server and grant
you access to it.  CentOS should be close enough to RHEL for such
testing.  If you can connect to my machine, but not to yours, it's
most likely that something's amiss on your server side.  Would that be
something you would be interested in trying out?


Also, you could try out a different X2GoClient implementation known as
PyHoCa-GUI.  This one uses paramiko, not libssh.

To test that on a Linux client:
If you haven't done so already, add the X2Go repository for EPEL to
your client's YUM system, as described here:
http://wiki.x2go.org/doku.php/wiki:repositories:epel
then type
sudo yum install pyhoca-gui

To test that on a Windows client:
Download and install PyHoCa-GUI for Windows from here:
http://code.x2go.org/releases/binary-win32/pyhoca-gui/releases/0.5.0.4-20150125/PyHoca-GUI_0.5.0.4-20150125_win32-setup.exe

Sadly, PyHoCa-GUI is currently not available for OS X, so for those
tests, you should use a Linux or Windows client.

If you can connect using PyHoCa-GUI, it looks like the issue is
libssh-related.

-Stefan

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