x2go-user

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2315 discussions

Encryption Algorithms
by Robert Dinse 19 Feb '16

19 Feb '16

Is there anyway to specify which encryption algorithms x2go allows or tries to use? I have a problem where I've got the latest and greatest installed, Ubuntu 15.10, latest client, etc. I have customers with old Ubuntu like 12.04LTS, and they can't connect with their old x2go clients because it can't establish a compatible set of encryption. I'd like them of course to upgrade their OS and software and they do understand the reason old algorithms have been blacklisted is that they are insecure, but they are resistant to doing so for a variety of reasons, hardware that doesn't work well or at all with modern releases, legacy software they want to keep running, etc. So I'm looking for a fix that will allow them to connect with their antique software. -_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_- Eskimo North Linux Friendly Internet Access, Shell Accounts, and Hosting. Knowledgeable human assistance, not telephone trees or script readers. See our web site: http://www.eskimo.com/ (206) 812-0051 or (800) 246-6874.

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How to change OS X x2go client keyboard shortcuts?
by Alex Coventry 10 Feb '16

10 Feb '16

In the OS X client, Control-Option-F toggles fullscreen. I would like to pass the chord through to the server, because C-M-F in emacs is forward-sexp. Is there an easy way to do that? I've tried putting a file at ~/.x2go/config/keystrokes.cfg with the following contents: <!DOCTYPE NXKeystroke> <keystrokes> </keystrokes> However, Control-Option-F still results in toggling fullscreen. Stack Exchange question about this. <http://superuser.com/questions/1037305/how-can-i-change-x2gos-keyboard-shor…> Best regards, Alex

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optimizing x2go resource use
by Jordan Poppenk 09 Feb '16

09 Feb '16

Dear X2Go users, I'm working on optimizing resource use of a largish-number of sessions. I made a few optimizations, e.g., disabling xscreensaver, but there were a few things I couldn't figure out on my own. Is someone here able to help? 1) Does X2Go do its desktop rendering on the server's GPU? That is, in building a server to support X2Go sessions, should I buy a fancy graphics card when trying run many sessions; or alternatively multiple core CPU's? If GPU matters, does it matter whether the card is of the GeForce vs. Quadro variety? 2) Does reducing colour depth have any substantive effect on the CPU/GPU/bandwitdth burden on the server? My users don't really need more than thousands of colours. I know this and JPEG quality can be adjusted client-side, but when I played with these settings, it didn't seem to impact server-side bandwidth (which continued to hover around 1Mbit per client even with just a few colours). Should I be adjusting this in the LXDE startup settings instead? 3) Is it fair to estimate that I need about 1Gb of RAM per client (just to load the desktop) just to load LXDE as the desktop? Cheers, Jordan Jordan Poppenk, Ph.D. Canada Research Chair in Cognitive Neuroimaging Department of Psychology and Centre for Neuroscience Studies Queen's University http://popmem.com 613-533-6009

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x2goagent memory usage (leak?)
by Stefan Seidel 09 Feb '16

09 Feb '16

Hi, I have used x2go for a while now and I observed that on the server, the process x2goagent is increasingly using more memory over time. I starts out with something like 300 MB, and rises steadily. I leave the session disconnected (suspended) when I leave work (usually I just shut down the client PC). The next day, memory usage is much higher, roughly 1GB. And this continues until the process uses too much memory and gets killed (or other processes get killed first). The server: - Ubuntu 12.04, CPU i7-860, RAM 24GB, 32 bit kernel (with PAE) ~> x2goversion x2goagent: 3.5.0.32 x2goserver: 4.0.1.19 x2goserver-extensions: 4.0.1.19 x2goserver-xsession: 4.0.1.19 Anyone observing a similar behaviour? Is it important whether I do x2gosuspend-session or just kill the client? Stefan

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Nightly Build Badly Broke
by Robert Dinse 05 Feb '16

05 Feb '16

I just upgraded to nightly build and it is horribly broken on Ubuntu Wily. When I try to connect to a remote site I get: Connection failed. mesg: ttyname failed: Inappropriate ioctl for device I can no longer connect to anything. -_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_- Eskimo North Linux Friendly Internet Access, Shell Accounts, and Hosting. Knowledgeable human assistance, not telephone trees or script readers. See our web site: http://www.eskimo.com/ (206) 812-0051 or (800) 246-6874.

2 6

X2Go speed (Gb LAN) vs. pure X
by Stefan Seidel 02 Feb '16

02 Feb '16

Hi, I am currently testing X2Go to be a replacement for our (1GBit/s) LAN XDMCP setup. I have set up a Jessie X2Go-PXE server VM with a Jessie chroot env. It is working in principle, I can get a connection and the advantage of session suspend/resume is great. (Although I had to remove the pulseaudio startup from the x2gosessiond to make it work.) However, I have two problems: 1. How can I set client-specific X11 options? We have clients with complex multi-monitor setups. Xinerama doesn't seem to be working, either, once I have set the screens on the client (using Ctrl+Alt+F1, then xrandr) and connect, the X session only sees one "big" screen. 2. Speed: for small screen updates (menu items etc.) - I would guess < 10k pixels - X2Go is very speedy and responsive. For anything larger (Google Chrome being a serious offender, as it always updates the whole rendering area) it is much slower. Even just scrolling in Firefox is "laggy". Pure X is much faster for these large screen updates. I have tried various settings, 4k-jpeg is almost acceptable speed-wise but still not fast enough. Test setup: X2Go-Server: Core i7-860 (4x2.8GHz), 24G RAM X2Go-PXE: VM with 4GHz AMD, 2G RAM Clients: Pentium D 2.8GHz, 512MB RAM, nVidia Dual-DVI graphics (model 6200 IIRC) with 2 1600x1200 monitors -> 2400x1600 total screen area. Clients use NOUVEAU and report Chipset: "NVIDIA NV44" Thanks in advance for any hints, Stefan

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4.0.5.1-0~1145~ubuntu15.10.1 Broken
by Robert Dinse 01 Feb '16

01 Feb '16

4.0.5.1-0~1145~ubuntu15.10.1 will not connect giving the previously mentioned ioctl inappropriate for device message, but 4.0.5.0 does work, unfortunately 4.0.5.0 does not have the "adaptive" option. 16m-jpeg 9 works for everything except 1024 full screen video and then only an occasional stutter so not urgent but would be nice to have the latest and greatest function. -_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_- Eskimo North Linux Friendly Internet Access, Shell Accounts, and Hosting. Knowledgeable human assistance, not telephone trees or script readers. See our web site: http://www.eskimo.com/ (206) 812-0051 or (800) 246-6874.

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Re: [X2Go-User] kex error
by Mihai Moldovan 30 Jan '16

30 Jan '16

On 29.01.2016 06:07 PM, KARL A. WOELFER wrote: > Thanks Mihai - > > Great point - I will check the ssh server. > Here is the sshd_config on the server (I commented out the KexAlgorithms section, to re-enable normal 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 You must NOT write this on two lines. This MUST be on one line. This is the reason sshd did not start. Mihai

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Debian 8.3 - packages cannot be installed
by KARL A. WOELFER 30 Jan '16

30 Jan '16

Hello all - I am not able to install x2go on the latest Debian 8.3 (amd64). Is this a known problem? Any workarounds would be greatly appreciated. Thanks, - Karl Here are the dependency/broken packages messages: root# apt-get install x2goserver Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: Reading package lists... 0% The following packages have unmet dependencies: x2goserver : Depends: libconfig-simple-perl but it is not installable Depends: pwgen but it is not installable Depends: libdbd-pg-perl but it is not installable Depends: libdbd-sqlite3-perl but it is not installable Depends: libfile-which-perl but it is not installable Depends: libcapture-tiny-perl but it is not installable Recommends: sshfs but it is not installable Recommends: x11-xfs-utils but it is not installable Recommends: x2goserver-extensions (= 4.0.1.19-0x2go2+git20160126.1064+jessie.main.1) but it is not going to be installed Recommends: x2goserver-xsession (= 4.0.1.19-0x2go2+git20160126.1064+jessie.main.1) but it is not going to be installed E: Unable to correct problems, you have held broken packages. Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: x2goserver : Depends: libconfig-simple-perl but it is not installable Depends: pwgen but it is not installable Depends: libdbd-pg-perl but it is not installable Depends: libdbd-sqlite3-perl but it is not installable Depends: libfile-which-perl but it is not installable Depends: libcapture-tiny-perl but it is not installable Recommends: sshfs but it is not installable Recommends: x11-xfs-utils but it is not installable Recommends: x2goserver-extensions (= 4.0.1.19-0x2go2+git20160126.1064+jessie.main.1) but it is not going to be installed Recommends: x2goserver-xsession (= 4.0.1.19-0x2go2+git20160126.1064+jessie.main.1) but it is not going to be installed E: Unable to correct problems, you have held broken packages.

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Paid Support?
by James M. Pulver 29 Jan '16

29 Jan '16

I'm trying to see if there's a contact for general support on using X2Go, and maybe feature bug fixing. The linked sites on the Wiki don't seem to have an English version, and there's no obvious contact link or e-mail address. I'm mostly looking for a ballpark idea of cost. (i.e. $xx per hour or $xxx for an estimate for work) I'm probably looking at issues on the X2Go Client(cross platforms) and a RHEL6 and 7 compatible server (Scientific Linux to be exact)... Please do contact me if you offer any of these services. -- James Pulver CLASSE Computer Group Cornell University

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