x2go-user February 2017

x2go-user@lists.x2go.org

23 participants
26 discussions

Multiple Xfce4 sessions from same user
by Rett D. Walters 22 Feb '17

22 Feb '17

Hi - This may not be specific X2go question, but I thought I would try anyway. For the last couple of years I was able to log in to a server with X2go to pull up a unique X session (using KDE4 or Xfce4) even when I was logged in on the console of the server with X running there. This never seemed to be an issue. Nowadays, this doesn't seem to be possible- I cannot login to Xfce4 via X2go if the same user is logged in on the local X console running Xfce4 as well. X2goclient starts the session and it immediately closes. My question is, specifically with Xfce4, what has changed in recent months that prevents this from working? Thanks, Rett Walters

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Heads-Up: Upcoming X2GoClient 4.1.0.0 Release / Sponsorship of X2Go macOS Client Development
by Stefan Baur 20 Feb '17

20 Feb '17

Hi everyone, a few days ago, Mihai (ionic) posted a call for translations to <x2go-i18n(a)lists.x2go.org>, in which he mentioned that he intends to have X2GoClient 4.1.0.0 release-ready around 2017-02-09. Key new features/bugfixes of this upcoming release are: - PulseAudio Support on macOS - updated SSHD handling for the client-side SSHD required for file and print sharing - fix for the "key error" messages also relating to SSHD that may have kept file and print sharing from working, esp. on Windows A full list of features and bugfixes will be published by Mihai once the official release takes place. This message is so you can plan ahead and find a spot in your personal schedule where you might want to download, test, and deploy the new client. I would also like to use this opportunity to introduce a new sponsor, CFD.direct. CFD Direct <http://cfd.direct> are the primary developers of OpenFOAM <http://openfoam.org>, the free, open source software for computational fluid dynamics. We received 1000 EUR from them as an initial payment, along with a statement that they intend to fund the project annually with a fixed percentage of their cloud revenue. Our plan is to use this money to rent a virtual macOS system running a current version of macOS, and add this as a Jenkins slave to our current build infrastructure. That way, creating new X2GoClient builds for macOS will be a lot easier (automated, nightly builds etc.). Due to personal vacation time, this will probably not happen before early April 2017, though with a little bit of luck we can start as early as Mid-February. Long story short: Especially if you're a macOS user, please give X2GoClient 4.1.0.0 a try once it's officially released, and report back any bugs with it on our bugtracker. Instructions on how to report bugs can be found here: http://wiki.x2go.org/doku.php/wiki:bugs#reporting_bugs If you feel like replying to this message, please DO NOT hit "reply to all". Instead, please respect the "Reply-To" header field and send your reply *only* to <x2go-project(a)lists.x2go.org>. Kind Regards, Stefan Baur -- BAUR-ITCS UG (haftungsbeschränkt) Geschäftsführer: Stefan Baur Eichenäckerweg 10, 89081 Ulm | Registergericht Ulm, HRB 724364 Fon/Fax 0731 40 34 66-36/-35 | USt-IdNr.: DE268653243

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x2goagent -nolisten tcp
by Mark Dixon 17 Feb '17

17 Feb '17

Hi there, I found this option in /etc/x2go/x2goagent.options that I'd like to comment out on a multi-user system, but am more than a little scared by the attached comment: # Launch X2Go's X-server x2goagent with option "-nolisten tcp". # # This is the default setting and the X2Go developers really recommend not to # touch this. However, if you play with this (i.e. if you comment it out) you # should really know what you are doing. # # For everyone else: don't touch the line below!!! X2GO_NXAGENT_DEFAULT_OPTIONS+=" -nolisten tcp" Is there any more detail behind the recommendation, please? Without more explanation, I feel that I might not know what I'm doing :) [I have a multi-user compute cluster with a batch scheduler, fronted by a login node with X2GO installed. I'd like to set a valid DISPLAY variable in an interactive batch job on a compute node, allowing it to run an X application which would then connect back to the x2goagent running on the login node] Thanks, Mark

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pyhoca-cli stopped working for me, ValueError: CTR mode needs counter parameter, not IV
by Markus 17 Feb '17

17 Feb '17

pyhoca-cli stopped working for me. I expected it to ask me for password, but instead it raises an exception. I don't know what happened, because this works all the time. And I think I didn't change anything. The error message is: "ValueError: CTR mode needs counter parameter, not IV" Used command: pyhoca-cli --server xxxxxxx -u xxxxxx -R xxxx-xx-xxxxxxxxxx_xxxxxxxx-session_xxxx The output: pyhoca-cli[14890] NOTICE: preparing requested X2Go session pyhoca-cli[14890] (PyHocaCLI) NOTICE: preparing requested X2Go session pyhoca-cli[14890] (x2gosessregistry-pylib) NOTICE: registering X2Go session Pyhoca-Client_Session... pyhoca-cli[14890] (x2goclient-pylib) NOTICE: initializing X2Go session... pyhoca-cli[14890] (x2gocontrolsession-pylib) NOTICE: connecting to [working]:22 No handlers could be found for logger "paramiko.transport" Traceback (most recent call last): File "/usr/bin/pyhoca-cli", line 422, in <module> thisPyHocaCLI.authenticate() File "/usr/lib/python2.7/dist-packages/pyhoca/cli/frontend.py", line 455, in authenticate self._X2GoClient__connect_session(self.x2go_session_hash, username=_username, password=self.args.password, force_password_auth=force_password_auth) File "/usr/lib/python2.7/dist-packages/x2go/client.py", line 1367, in connect_session sshproxy_force_password_auth=sshproxy_force_password_auth, File "/usr/lib/python2.7/dist-packages/x2go/session.py", line 1322, in connect **_params) File "/usr/lib/python2.7/dist-packages/x2go/backends/control/plain.py", line 1001, in connect look_for_keys=look_for_keys) File "/usr/lib/python2.7/dist-packages/paramiko/client.py", line 325, in connect t.start_client() File "/usr/lib/python2.7/dist-packages/paramiko/transport.py", line 492, in start_client raise e ValueError: CTR mode needs counter parameter, not IV

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Re: [X2Go-User] X2Go Client: Kex error : no match for method server host
by jmmec2014＠yahoo.com 16 Feb '17

16 Feb '17

Hi Karl, Thank you for your response! I took your example but it didn't work for me: I edited /etc/ssh/sshd_config on the server and restarted ssh, but X2GO still complained with the same kex error, but Pyhoca is still OK. I'll take a closer read and will try it again soon; maybe I messed up somehwere. ------ From: "KARL A. WOELFER" <kwoelfer(a)uw.edu> Hello - Here is a link with some background, which describes two workarounds : http://permalink.gmane.org/gmane.linux.terminal-server.x2go.user/2368 You would add this to your sshd_config file on the client (Linux) machine, then restart ssh # KexAlgorithms curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group14-sha1,diffie-hellman-group-exchange-sha1,diffie-hellman-group1-sha1 I hope this helps. - Karl

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Fwd: x2go browser plugin
by Aaditya Shidham 15 Feb '17

15 Feb '17

Thanks Ulrich. Can anybody answer this question fully? I am trying to decide whether to use x2go when I plan to have x2go clients in the browser. Is there any way to have the x2go client in the browser without NPAPI plugins, which are being universally deprecated? Also, are there any NX viewers in the browser (using HTML5 canvas and javascript)? ---------- Forwarded message ---------- From: Ulrich Sibiller <uli42(a)gmx.de> Date: Wed, Feb 15, 2017 at 5:49 AM Subject: Re: [X2Go-User] x2go browser plugin To: Aaditya Shidham <aashidham(a)gmail.com> On Wed, Feb 15, 2017 at 2:38 PM, Aaditya Shidham <aashidham(a)gmail.com> wrote: > A couple of questions: > > 1. Is there a way to view the x2go client in Chrome / Firefox / Safari in > OSX / PC yet? The documentation is sparse on non-Firefox clients with > non-Ubuntu OSs: > http://wiki.x2go.org/doku.php/wiki:advanced:x2goplugin# installation_ubuntu_debian_gnu_linux > > 2. Firefox is deprecating plugins very soon: > https://www.fxsitecompat.com/en-CA/docs/2016/plug-in- support-has-been-dropped-other-than-flash/ > Any contingency plans around this? Can't answer those . > 3. Is it currently possible to view x2go clients with noVNC or guacamole? AFAICS noVNC is a VNC client. guacamole supports VNC and RDP, X2Go uses NX which is neither VNC nor RDP. So the answer is no. But adding support to guacamole would be nice. Uli

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Compression method guidance
by Tristan Miller 14 Feb '17

14 Feb '17

Dear all, X2Go supports an awful lot of different compression methods. Is there any guidance available for which compression methods work best in which scenarios? I didn't see anything on the X2Go wiki but it's possible I've overlooked it. I can't even find a description of what all the different compression methods actually are, though I'm guessing that most of them are named in the format bits_per_pixel-image_compression_algorithm. For my own use, I usually use X2Go to run individual applications (not an entire desktop) remotely. These applications are primarily text-based, such as terminal emulators, text editors, and mail clients. The remote machines have upload speeds of about 3 Mbit/s. Would it make sense for me to choose something png-based rather than jpeg-based? 256-png perhaps, since I am not looking at any images other than toolbar icons? Regards, Tristan -- =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Tristan Miller Free Software developer, ferret herder, logologist https://logological.org/ =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-

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x2goagent-backtrace 3.5.99.3 libs
by nanook＠eskimo.com 11 Feb '17

11 Feb '17

Attached is a gdb backtrace of a core I got with a nightly build nxagent (nxagent.bt) installed this morning 2/11/2016 at about 4:00 AM or so with nx-libs 3.5.99.3. nxagent version is nxagent/trusty,now 2:3.5.99.3-0.1+git20161219.1907+14.04.release.1 amd64 [installed,automatic]. I was running rkhunter multiple times and editing the configuration file so that it would not produce false positives when on the last attempt to edit the conf file using nvi it exploded. I had edited this same file with nvi maybe half dozen times prior without it exploding. I'd send you the core but it's 153MB and I have postfix here set to limit mail to 50MB and I'm betting it is probably tighter on the receiving end but I will hang on to it in case someone cares to examine directly. This was under ubuntu 16.10 running on a KVM/QEMU virtual machine on a physical host i7-6700k based machine running ubuntu 16.04.2 LTS. If you need any other specifics let me know.

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x2go with "AllowTcpForwarding no"?
by Erik Starbäck 09 Feb '17

09 Feb '17

Hi! I totally understand I need "X11Forwarding yes", but if I unclick sshproxy, sound, remote printing, filesharing over tunnel why is then "AllowTcpForwarding no" not OK? Is this needed tunnel a major piece of the x2go-design? thanks! /Erik Starbäck, UPPMAX, Sweden

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x2golistsessions_root vs. x2golistsessions on x2goserver with postgres DB backend
by Stefan Baur 07 Feb '17

07 Feb '17

Hi $LIST, I'm not filing this as a bug (yet) as I'm not sure if this is intended behavior. On a default X2GoServer installation, with the SQLite DB backend, both x2golistsessions and x2golistsessions_root return sensible output - with x2golistsessions working "per user", and x2golistsessions_root, when invoked as root, shows all sessions. On an X2GoServer installation with the postgres DB backend, however, the output of x2golistsessions_root, when invoked as root, is always empty, while x2golistsessions works as expected for a regular user. So ... I figured "Hey, maybe it's because root doesn't have a file /root/.x2go/sqlpass" - so I tried creating one. Bzzt - "x2godbadmin --adduser root" returns 'The super-user "root" is not allowed to use X2Go'. I totally agree that root should not be able to start an X2Go session, but: 1) at present, in SQLite mode, root can start an X2Go session 2) root (or $SOME_USER_WITH_ADMIN_PRIVS - if it has to be a different user name, so be it) SHOULD be able to view the sessions list (at least for their own server, if not for the entire farm), regardless of which DB backend is in use. So what's the proper way of checking which sessions are active/suspended/etc. on the server "root" is logged in to, and/or in the entire farm handled by the postgres db instance it is linked to? -Stefan -- BAUR-ITCS UG (haftungsbeschränkt) Geschäftsführer: Stefan Baur Eichenäckerweg 10, 89081 Ulm | Registergericht Ulm, HRB 724364 Fon/Fax 0731 40 34 66-36/-35 | USt-IdNr.: DE268653243

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x2go-user February 2017