x2go-user June 2017

x2go-user@lists.x2go.org

13 participants
10 discussions

Re: [X2Go-User] ssh kex error
by is＠k4ts.net 13 Nov '18

13 Nov '18

Am 19.10.2015 17:06, schrieb Robert Dinse: > the new version of openssh disabled certain insecure > ciphers... Version7 is what you mean. I use 6.9 on both client and server. > you can add > the following line to your /etc/ssh/sshd_config manually enable the > insecure old ciphers: > > 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 Adding these ciphers doesn't help - same algo error, Thats wired coz I can ssh to the server without any issues. > -_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_- > 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. > > On Mon, 19 Oct 2015, is(a)k4ts.net wrote: > >> Date: Mon, 19 Oct 2015 15:12:43 +0200 >> From: is(a)k4ts.net >> To: x2go-user(a)lists.x2go.org >> Subject: [X2Go-User] ssh kex error >> >> hi, i'm not able to connect >> to my new hardened gentoo server using x2go. >> >> No matter which key type i select for the connection, >> the client (v. 4.0.5.0) terminates with the following: >> >> kex error : no match for method server host key algo: >> server [ssh-rsa,ssh-ed25519], client [ecdsa-sha2-nistp256] >> >> I have rsa and ed25519 keys on my client and server. >> >> sshing from the shell works like always. log is attached. >> >> do you have an idea, whats might wrong? >> >> thx, >> k4t >> >> k4tfish@e10 ~ $ ssh k4tfish@host >> OpenSSH_6.9p1-hpn14v5, OpenSSL 1.0.2d 9 Jul 2015 >> debug1: Reading configuration data /etc/ssh/ssh_config >> debug1: Connecting to host.net port 51822. >> debug1: Connection established. >> debug1: identity file /home/k4tfish/.ssh/id_rsa type 1 >> debug1: key_load_public: No such file or directory >> debug1: identity file /home/k4tfish/.ssh/id_rsa-cert type -1 >> debug1: key_load_public: No such file or directory >> debug1: identity file /home/k4tfish/.ssh/id_dsa type -1 >> debug1: key_load_public: No such file or directory >> debug1: identity file /home/k4tfish/.ssh/id_dsa-cert type -1 >> debug1: key_load_public: No such file or directory >> debug1: identity file /home/k4tfish/.ssh/id_ecdsa type -1 >> debug1: key_load_public: No such file or directory >> debug1: identity file /home/k4tfish/.ssh/id_ecdsa-cert type -1 >> debug1: key_load_public: No such file or directory >> debug1: identity file /home/k4tfish/.ssh/id_ed25519 type -1 >> debug1: key_load_public: No such file or directory >> debug1: identity file /home/k4tfish/.ssh/id_ed25519-cert type -1 >> debug1: Enabling compatibility mode for protocol 2.0 >> debug1: Local version string SSH-2.0-OpenSSH_6.9p1-hpn14v5 >> debug1: Remote protocol version 2.0, remote software version >> OpenSSH_6.9p1-hpn14v5 >> debug1: match: OpenSSH_6.9p1-hpn14v5 pat OpenSSH* compat 0x04000000 >> debug1: Authenticating to host...net:51822 as 'k4tfish' >> debug1: SSH2_MSG_KEXINIT sent >> debug1: SSH2_MSG_KEXINIT received >> debug1: AUTH STATE IS 0 >> debug1: REQUESTED ENC.NAME is 'chacha20-poly1305(a)openssh.com' >> debug1: kex: server->client chacha20-poly1305(a)openssh.com <implicit> >> none >> debug1: REQUESTED ENC.NAME is 'chacha20-poly1305(a)openssh.com' >> debug1: kex: client->server chacha20-poly1305(a)openssh.com <implicit> >> none >> debug1: expecting SSH2_MSG_KEX_ECDH_REPLY >> debug1: Server host key: ssh-ed25519 SHA256:xyz >> debug1: Host '[host.net]:51822' is known and matches the ED25519 host >> key. >> debug1: Found key in /home/k4tfish/.ssh/known_hosts:203 >> debug1: SSH2_MSG_NEWKEYS sent >> debug1: expecting SSH2_MSG_NEWKEYS >> debug1: SSH2_MSG_NEWKEYS received >> debug1: Roaming not allowed by server >> debug1: SSH2_MSG_SERVICE_REQUEST sent >> debug1: SSH2_MSG_SERVICE_ACCEPT received >> debug1: Authentications that can continue: >> publickey,password,keyboard-interactive >> debug1: Next authentication method: publickey >> debug1: Offering RSA public key: /home/k4tfish/.ssh/id_rsa >> debug1: Server accepts key: pkalg ssh-rsa blen 279 >> debug1: Authentication succeeded (publickey). >> Authenticated to host ([123.123.456.7]:51822). >> debug1: Final hpn_buffer_size = 2097152 >> debug1: HPN Disabled: 0, HPN Buffer Size: 2097152 >> debug1: channel 0: new [client-session] >> debug1: Enabled Dynamic Window Scaling >> debug1: Requesting no-more-sessions(a)openssh.com >> debug1: Entering interactive session. >> debug1: client_input_global_request: rtype hostkeys-00(a)openssh.com >> want_reply 0 >> debug1: Sending environment. >> debug1: Sending env LC_COLLATE = C >> debug1: Sending env LANG = en_US.utf8 >> >> _______________________________________________ >> x2go-user mailing list >> x2go-user(a)lists.x2go.org >> http://lists.x2go.org/listinfo/x2go-user >>

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Emacs crashes on start
by Roderick Johnstone 18 Sep '17

18 Sep '17

Hi I'm connecting from a Mac (X2Go Client v. 4.0.5.1 (Qt - 4.8.7)) to Fedora 24 with a xfce session using the x2goserver-4.0.1.19-11.fc24.x86_64 packages from the fedora repos. On starting emacs, I get the error below. This issue seems to have been around for a while in similar forms, but didn't affect me under Fedora 22. Is anyone in a position to confirm this issue on Fedora 24 and suggest a work around? I tried setting various environment variables suggested on various web pages for similar issues and in the bug report noted in the error message (and checked /etc/PROBLEMS), but nothing was effective. emacs starts fine in an xfce session at the console. Thanks Roderick Johnstone X protocol error: BadRequest (invalid request code or no such operation) on protocol request 131 When compiled with GTK, Emacs cannot recover from X disconnects. This is a GTK bug: https://bugzilla.gnome.org/show_bug.cgi?id=85715 For details, see etc/PROBLEMS. Fatal error 6: Aborted Backtrace: emacs[0x50ad3c] emacs[0x4f11ec] emacs[0x50ade3] emacs[0x4c0f60] emacs[0x4c58b6] emacs[0x4c593b] /lib64/libX11.so.6(_XError+0x12d)[0x2b5baa0ff57d] /lib64/libX11.so.6(+0x413e7)[0x2b5baa0fc3e7] /lib64/libX11.so.6(+0x414ad)[0x2b5baa0fc4ad] /lib64/libX11.so.6(_XReply+0x238)[0x2b5baa0fd478] /lib64/libX11.so.6(XQueryPointer+0x91)[0x2b5baa0f3351] /lib64/libgdk-3.so.0(+0x4da2a)[0x2b5ba8150a2a] /lib64/libgdk-3.so.0(+0x6a605)[0x2b5ba816d605] /lib64/libgdk-3.so.0(gdk_window_get_device_position_double+0x10b)[0x2b5ba8143d1b] /lib64/libgdk-3.so.0(gdk_window_get_device_position+0x2d)[0x2b5ba8143e1d] /lib64/libgtk-3.so.0(+0x321199)[0x2b5ba7b48199] /lib64/libgtk-3.so.0(+0x3216f4)[0x2b5ba7b486f4] /lib64/libgdk-3.so.0(+0x253d8)[0x2b5ba81283d8] /lib64/libglib-2.0.so.0(+0x4a173)[0x2b5ba97d0173] /lib64/libglib-2.0.so.0(g_main_context_dispatch+0x163)[0x2b5ba97cf703] emacs[0x5e0b78] emacs[0x5a6025] emacs[0x4fc1bc] emacs[0x4fdfdd] emacs[0x4ffc24] emacs[0x564642] emacs[0x4f16b4] emacs[0x5645e3] emacs[0x4f1670] emacs[0x4f5e6b] emacs[0x4f61c8] emacs[0x419b52] /lib64/libc.so.6(__libc_start_main+0xf1)[0x2b5bb17db731] emacs[0x41a639] Aborted (core dumped)

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x2godesktopsharing Connection error No protocol specified xwininfo: error: unable to open display ":0"
by Víctor J. Sánchez 01 Aug '17

01 Aug '17

Hi all, I'm trying to connect to an existing user session (local desktop mode) to help him in a remote host using x2godesktopsharing feature but I always get the next error (the first is in spanish): Error en la conexión No protocol specified xwininfo: error: unable to open display ":0" No protocol specified xwininfo: error: unable to open display ":0" The scenario is: - Remote host: Linux Mint 18.1 x64, Plasma 5 session, nopasswordlogin user and unprivileged (user A) logged in, X2Go Desktop Sharing running and enabled, administrator (sudoer) user B included in group x2godesktopsharing x2goversion: x2goagent: 3.5.0.32 x2godesktopsharing: 3.1.1.3 x2goserver: 4.0.1.20 x2goserver-printing: 4.0.1.20 x2goserver-xsession: 4.0.1.20 - Local host: Fedora 25 Workstation x64, Plasma 5 session x2goversion: cups-x2go: 3.0.1.3 x2goagent: 3.5.0.32 x2goserver: 4.0.1.20 x2goserver-extensions: 4.0.1.20 x2goserver-fmbindings: 4.0.1.20 x2goserver-printing: 4.0.1.20 x2goserver-xsession: 4.0.1.20 Client X2Go v. 4.1.0.0 (Qt - 4.8.7) I also tested on a local host with Windows 10 X2Go client and the error is the same. However other connection types (terminal or published applications) work fine. I've also tried with another remote sessions: XFCE, Cinnamon, ... the same result. Also I've observed that if the remote user A executes in a terminal window the "xhost +" command, when the user B connects to remote host with local desktop mode a window to choose a desktop is presented but only appears "non-existent" user B sessions (user B, screen :0) instead of user A session. What's wrong here? Thanks for your support. Regards.

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Issue with specific application
by carl langlois 14 Jul '17

14 Jul '17

Hi Let me first say that x2go is working very nicely. Most of our application are running just fine in multiwindows mode. But we notice that application that are base on the TCl/TK widget seem to be much slower in refreshing and even freezing all windows running over x2go. One the specific application is mentor graphic questasim. We also have internal application written in perl/tk that seem to slower compare to others. I have many different setting but nothing help. If i run in desktop mode the application work fine. Any help would be appreciated. Regards CL

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Workaround for X2go's unclickable regions under Gnome 3
by Jason Heeris 25 Jun '17

25 Jun '17

I'm running X2go 4.1.0.0-0~1536~ubuntu17.04.1 under Ubuntu 17.04, using Gnome 3.24 as my desktop environment on the client. Unfortunately this means I keep running into bug #1072/#982, where the top of X2go's session screen is unclickable. Thus I can't close windows, open some menus, etc. See: https://bugs.x2go.org/cgi-bin/bugreport.cgi?bug=982 https://bugs.x2go.org/cgi-bin/bugreport.cgi?bug=1072 I'm looking for a way to work around this without completely throwing out my workflow in general. Because my laptop screen is small, running anything less than full screen makes things fiddly and hard to do (plus mostly what I want to do involves graphics). I don't really want to close everything else I'm working on and log in again to XFCE to do something on the server. Is there a way to tweak X2go config or Gnome 3 to avoid this, or an extension somewhere that mitigates it? Even something I could run or change just before launching X2go that I could revert afterwards? Any suggestions would be appreciated. Cheers, Jason

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Logging into x2go session on server
by Ali Morshedi 20 Jun '17

20 Jun '17

Dear all, I use x2go to connect to my office computer (ubuntu 16.04 using XFCE desktop environment). Let's say I'm logged into the server with x2go. Now if I go to my server computer and log in, it logs into a new and different desktop. My question is: is there a way to log into the same desktop that x2go is using when I go back to the office (on my server computer)? Note: I tries using "Connect to local desktop". It does what I want but the image quality is significantly reduced and things become slow and laggy. Thank you in advance, Ali ᐧ

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X2Go: The Gathering 2017 Location - Voting period has been extended!
by Stefan Baur 20 Jun '17

20 Jun '17

+++ Attention +++ Attention +++ Attention +++ Attention +++ X2Go: The Gathering 2017 will be taking place 2017-09-22 to 2017-09-24 *Voting deadline has been extended! Vote for your favorite location!* Folks, we need your votes! Even if there's only a remote chance that you could attend our event at one or more of the listed locations, please, please, please cast your vote! We currently have *the same amount of votes* for *all locations*, which obviously isn't helpful for decision-making. Who's allowed to vote: Everyone that has read the Wiki page or that has received this voting notification via one of the X2Go Mailing Lists, *and hasn't cast their vote yet.* If *you haven't voted yet*, but would like to take part in the voting process, please list the locations you would like to vote for in an E-Mail to: gathering-2017-vote(a)baur-itcs.de Valid options are: - Essen - Stuttgart - Treuchtlingen Please list the locations in the order of your preference: - First entry gets 3 points - Second entry gets 2 points - Third entry gets 1 point If you are unwilling to attend at a particular location, then do not list it at all. *Deadline: We need your vote by Thursday, 2017-06-25, 23:59:59 CEST.* Please note that we will try to respect the outcome of the vote as good as possible, but we reserve the right to pick a different location than the one that gets the most votes in case we detect voting fraud or in case some unforeseen circumstances (like a hotel suddenly becoming unavailable) require us to relocate. To see a detailed description of all locations, as well as their pros and cons, and entertainment options, please visit: <https://wiki.x2go.org/doku.php/events:x2go-gathering-2017> Kind Regards, Stefan Baur (with my X2Go event planner hat on) -- 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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Re: [X2Go-User] Worse image quality after upgrading Firefox to 52 ESR
by Stefan Seidel 15 Jun '17

15 Jun '17

Hi, Firefox 47 disabled XRender by default. It means that remote protocols will see the whole Firefox content as image and deal with it accordingly. For now you can set xrender to true (in about:config search for xrender). It will probably stop working at some point. Stefan

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Worse image quality after upgrading Firefox to 52 ESR
by south0＠tuta.io 15 Jun '17

15 Jun '17

Hi, after upgrading Firefox form v45 ESR to v52 ESR, the image quality in the X2Go client dropped considerably. Using the same setup in both cases, I now see "blocks" of JPEG artifacts scattered around the window. My setup: - Ubuntu 16.04 LTS i686 - X2Go server from stable PPA - X2Go Qt client in Windows (tested in 7 and 10) - nx set to link=lan, pack=adaptive-9, the rest as default - Firefox from Mozilla's builds (https://ftp.mozilla.org/pub/firefox/releases) I'm untaring Firefox to a dedicated dir and pointing X2Go to execute it. The tests were made with fresh Firefox profiles in both cases, with HW acceleration disabled and rendering by cairo. A major difference is that Firefox 45 uses GTK2 while Firefox 52 uses GTK3. The areas with artifacts seem to be placed randomly. Icons next to each other in the chrome may or may not be affected. Multiline paragraphs are sometimes divided across the upper/lower middle of the characters. If I highlight text around quickly, or zoom in/out, I can make the artifact blocks "jump" to other areas in the viewport. After tweaking the font configs, I managed to get rid of the artifacts consistently in text-only documents by using an aliased font against a solid background. Artifacts in the chrome remain nevertheless. If I set the nx pack to rle for instance, the artifacts disappear. I'd still like to know if - this is a bug or expected behaviour - I can still use adaptive-9 while getting a constant/reproducible image quality Let me know if you need more info or sceenshots. Thanks in advance.

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X2Go vs. XRDP
by Stefan Seidel 13 Jun '17

13 Jun '17

Hi, I have been trying to get X2Go to a usable state for a long time. Some may remember that I posted about slow performance even with Gigabit networking, mostly web browser usage was problematic. After having spent very much time trying to optimise X2Go to make it perform acceptably, I gave up. I then found and tried XRDP, and all my problems are solved. Although XRDP (with xorgxrdp drivers) uses more bandwith than X2Go, it is much more usable in almost all situations. Even ADSL links work ok, but with Gigabit connectivity it really flies (including video). I don't like to advertise for other "products", but this has made such a difference that I could not withhold this information from those who are not satisfied with X2Go. Maybe as a means of making X2Go better, I would encourage X2Go developers to install XRDP on a test server and test and compare its performance to X2Go. I would be surprised if X2Go would perform better - in fact I was surprised how much better XRDP was. Maybe there are things that can be done in X2Go to make it better by looking at how XRDP does things. I really wanted X2Go to work, but somehow it didn't work for me. I wish you all the best for improving the project in the future! Stefan

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x2go-user June 2017