x2go-user

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Re: [X2Go-User] x2go fails with tcsh
by Mihai Moldovan 11 Oct '17

11 Oct '17

On 10/09/2017 12:44 PM, Frank Steiner wrote: > I was able to solve this. When I looked into the code, I saw that you > already to use "bash -c '...'" for all commands, so quoting shouldn't be > an issue. I really think it can get problematic easily, for instance with nested single quotes, that require special handling that differs from shell to shell - same thing for double quotes. Looks like you weren't hit by that issue, though. :) > But as the error message for tcsh was about > Warning: Protocol mismatch or no X authentication data. > I started looking at xauth and found an interesting difference between > bash and tcsh as login shell. > > For bash, these entries are added by x2gostartagent: > > myhost/unix:59 MIT-MAGIC-COOKIE-1 e938deb788659f0bf8c99069d199aff6 > myhost.ifi.lmu.de:59 MIT-MAGIC-COOKIE-1 e938deb788659f0bf8c99069d199aff6 > myhost.ifi.lmu.de:59 MIT-MAGIC-COOKIE-1 e938deb788659f0bf8c99069d199aff6 I knew that we're adding two entries, but it didn't come across that this might be the issue. Great debugging! Thanks. What feels odd is that there are three entries, two of which are equal. I'm not sure where the third one is coming from - in a quick test, I only see two entries on one of my sessions. Might be related to nxproxy adding another entry via xauth as well, but it still feels odd. Especially given that the two xauth calls in x2gostartagent both use ${HOSTNAME}, if ${HOSTNAME} is only "myhost", there should only be entries for myhost/unix:DISPLAY and myhost:DISPLAY. > For tcsh, I got those: > myhost.ifi.lmu.de/unix:58 MIT-MAGIC-COOKIE-1 7212fb8aa466de75ea0224a4d010f5e4 > myhost.ifi.lmu.de:58 MIT-MAGIC-COOKIE-1 7212fb8aa466de75ea0224a4d010f5e4 > myhost.ifi.lmu.de:58 MIT-MAGIC-COOKIE-1 7212fb8aa466de75ea0224a4d010f5e4 > > And that's the point! For some reason, x2go needs the cookie for > display "myhost/unix" at some point and "myhost.ifi.lmu.de/unix" > doesn't suffice. > > Indeed, when I wrote a little bash script > > #!/bin/bash > echo $HOSTNAME > > and called it with "ssh myhost bash -c './testscript'", it echoed > "myhost" with login shell bash, and "myhost.ifi.lmu.de" with > login shell tcsh. That's very interesting. bash seems to automatically populate HOSTNAME according to its man page, but the tcsh man page doesn't mention HOSTNAME at all -- only HOST, which is populated automatically by the gethostname() libc call and (on my system) returns the short hostname. I guess HOST and HOSTNAME might be the shell equivalents. It gets worse, though. I tested this on OS X, which is a BSD-like system. On this system, tcsh's HOST and bash's HOSTNAME values were the same again, BUT both included the domain name (and, incidentally, the 'hostname' program's default behavior is to print the FQDN hostname, which corresponds to the hostname returned by gethostname().) This may not sound interesting at first, because OS X is not an X2Go Server target, but according to the hostname man pages on FreeBSD, this matches this system's behavior (and it would be nice to eventually support *BSD as well at some point in time, even though that's not possible currently.) Luckily, all of them support the -s flag to hostname, so I'll just make use of it. > I'm not yet sure where this difference comes from, if it's deep inside > bash and tcsh or in some server-wide login scripts from SuSE (it > was not in the users dotfiles, we even removed them all). Whatever sets it, it's not tcsh itself. Likely some global startup script. Care to grep -R HOSTNAME /etc? The problem at hand really is that something sets and exports HOSTNAME. Since this variable is then defined in the environment, bash won't touch it. Clearly x2gostartagent uses bash (even if called from a tcsh shell) - but it inherits the exported HOSTNAME value and stuff goes boom. In my opinion, that's a bug that the distro should take care of. IMHO, the global startup scripts can set HOSTNAME, but shouldn't export this variable to the environment. > Anwyay, I added "setenv HOSTNAME `uname -n`" to my .cshrc and: > x2go works :-) Better use hostname -s. > To make that work for all our users I added > HOSTNAME=${HOSTNAME%%.*} > into x2gostartagent which doesn't harm if HOSTNAME is already > without the domain. So maybe you could add this to the next > release to help people running into the same issue. I'll fix up the server script. Mihai

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x2goclient MacOS
by Robert Dinse 11 Oct '17

11 Oct '17

x2go-client versions 4.1.0.0 and 4.1.1.0 both core dump under MacOS X 10.7.5 (Lion). 4.0.0.1 does not but also will not login to a non-root account on Ubuntu server. -_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_- 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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x2go fails with tcsh
by Frank Steiner 09 Oct '17

09 Oct '17

Hi, we just tried to x2go for the first time (client 4.0.5.2 server 4.0.1 on SLED 12). It works fine for users with bash as login shell on the server side, but fails for those with tcsh. According to http://blog.x2go.org/index.php/2012/07/26/x2go-sessions-startups-for-users-… this should have been fixed a while ago, but it seems to have returned. I couldn't see any difference neither in the server log (debug level) nor in the output of "x2goclient --debug". The clients are identical until the line x2go-DEBUG-../src/onmainwindow.cpp:6014> Proxy wrote on stderr: "Session: Session started at 'Fri Oct 6 16:43:09 2017'. and then the tcsh instance exits with Warning: Protocol mismatch or no X authentication data. while the bash version continues with x2go-DEBUG-../src/onmainwindow.cpp:6014> Proxy wrote on stderr: "Info: Established X server connection. The server logs are identical until the line 2017-10-06T16:43:09.173981+02:00 knuth /usr/lib/x2go/x2gocreatesession[21667]: db_createsession called, session ID: fst-76-1507300986_stDmwm_dp24, cookie: 7b94de4d7f6bdbcda01a3dc547c42f66, client: xx:xx:xx:xx, pid: 21620, graphics port: 35760, sound port: 35761, file sharing port: 35762 and then the tcsh instance exits with 2017-10-06T16:43:15.007175+02:00 knuth sshd[21228]: pam_unix(sshd:session): session closed for user fst 2017-10-06T16:43:15.011998+02:00 knuth systemd-logind[9940]: Removed session 59. Is this problem known already? Sth. I could try to solve it? We wouldn't like to force all our users to switch away from their tcsh... cu, Frank -- Dipl.-Inform. Frank Steiner Web: http://www.bio.ifi.lmu.de/~steiner/ Lehrstuhl f. Bioinformatik Mail: http://www.bio.ifi.lmu.de/~steiner/m/ LMU, Amalienstr. 17 Phone: +49 89 2180-4049 80333 Muenchen, Germany Fax: +49 89 2180-99-4049 * Rekursion kann man erst verstehen, wenn man Rekursion verstanden hat. *

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X2Go for non-bash users
by Marlin Whitaker 07 Oct '17

07 Oct '17

We have found that a user whose default shell is tcsh is affected by bash startup files when running X2Go. I assume this because x2go runs under the bash script x2goruncommand and inherits its environment. Is this correct? Is there any way around this problem? Thanks. -- Marlin

1 1

Connect Time
by Robert Dinse 06 Oct '17

06 Oct '17

Just for drill, I timed the amount of time it took to connect using my 2005 vintage Mac Pro 1,1, a whole of 5 seconds. -_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_- 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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ttyname failed error
by Joshua Alexander 05 Oct '17

05 Oct '17

Hello all, I'm trying to get x2go set up on CentOS 6. When I try to connect the client says "Connection failed. megs: ttyname failed. Invalid argument megs: ttyname failed: Invalid argument"... any ideas how to troubleshoot? Thanks, Josh

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Re: [X2Go-User] Incomplete redrawing,of screen
by Ulrich Sibiller 04 Oct '17

04 Oct '17

What window manager are you using on the client? Uli Vom Smartphone gesendet. ----- Ursprüngliche Nachricht ----- Von: "K. Reinhold Trier" <R.Trier(a)it-jobst.de> Gesendet: ‎04.‎10.‎2017 19:03 An: "Ulrich Sibiller" <uli42(a)gmx.de> Betreff: Re: [X2Go-User] Incomplete redrawing,of screen Am 03.10.2017 um 17:37 schrieb Ulrich Sibiller: >> OK, but nevertheless I would like to know what I can do about it. For sure >> it's not a software-problem. I have an automated installation script which >> installs thick clients with the same software on different hardware. The >> installation runs fine e.g. on a virtual box on my workstation. And it runs >> also fine on a ZBOX when I use the VGA connection. Is there anybody who has >> solved the problem (maybe by changing parameters for the HDMI-Connection) or >> is the solution simply to buy more expensive hardware? > Well, some Ubuntu bug reports suggest activating "Intel tearfree mode" > for your hardware - however, I don't know what that is or if it yould > help here. Thank you, I'll try that when I find the time to do it >>> What Desktop Environment are you using? Does the problem happen with >>> other Desktop Environments, too? Does it show in singe application >>> mode? >> If you mean by single application mode that an application uses full screen: it's not shown in that case > No, I mean that you connect to the x2goserver and only run a single > application that is shown on your display just like any local software > would. You can activate that by going to the session setting in > x2goclient, first tab, last row and select "Application" instead of > "XFCE" or "KDE" or whatever. I tried it with Firefox. The error does not happen in this case - anyhow it happens only when window frames are crossing. But I had a different difficulty: the menus in the first line didn't work. When clicking on them, only a short flash appeared and disappeared. I was not able to leave the program and had to restart the box. Reinhold

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Re: [X2Go-User] Incomplete redrawing,of screen
by K. Reinhold Trier 03 Oct '17

03 Oct '17

It's not a problem of the of the Xserver. A (software) screenshot shows a correct screen, this is what the Xserver "thinks" he would display whereas the real screen is scrambled. But only in the case of a x2go-connection, not in local operations. And - as described before - only when using hardware of somehow low performance together with HDMI connection. I found a posting describing a similar problem: http://lists.x2go.org/pipermail/x2go-user/2016-February/003717.html Reinhold Am 02.10.2017 um 17:29 schrieb Ulrich Sibiller: > On Mon, Oct 2, 2017 at 4:49 PM, K. Reinhold Trier > <R.Trier(a)it-jobst.de> wrote: >> Hello, >> >> we are using x2go server and clients both on Ubuntu 16.04. After >> configuring new clients on small single board boxes like a ZODAC >> Zbox or a Raspberry Pi 3 we observe severe screen redrawing >> problems an a very poor performance in video transfer. E.G. >> shifting a Thunderbird-window over a Firefox-window the latter >> remains scrambled with rests of Thunderbird. We didn't run into >> that problem in our former installation based on Ubuntu 12.04. >> After searching for solutions in the compression method and the >> CPU-performance of the clients I occasionally found out that the >> problem disappears after connecting the client's monitor via VGA >> instead of a HDMI connection. The problem even disappears when a >> HDI/VGA-Adapter is used and the signal is fed to the monitor via an >> VGA-input. This was tested with different monitors. In our former >> clients we only used VGA connected monitors and so we could not see >> the problems. The optical quality of a HDMI connected Monitor is >> notably better than that of VGA connected one, furthermore the VGA >> connection seems to become obsolete, so we would like to stay with >> HDMI. What can be the reason and is there a way change the >> HDMI-output in to a suitable configuration? > > To me this sounds like a buggy Xserver on the client. There's really > nothing in X2go (or better: in NX) that cares about the type of > connection. > > Uli

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Incomplete redrawing,of screen
by K. Reinhold Trier 02 Oct '17

02 Oct '17

Hello, we are using x2go server and clients both on Ubuntu 16.04. After configuring new clients on small single board boxes like a ZODAC Zbox or a Raspberry Pi 3 we observe severe screen redrawing problems an a very poor performance in video transfer. E.G. shifting a Thunderbird-window over a Firefox-window the latter remains scrambled with rests of Thunderbird. We didn't run into that problem in our former installation based on Ubuntu 12.04. After searching for solutions in the compression method and the CPU-performance of the clients I occasionally found out that the problem disappears after connecting the client's monitor via VGA instead of a HDMI connection. The problem even disappears when a HDI/VGA-Adapter is used and the signal is fed to the monitor via an VGA-input. This was tested with different monitors. In our former clients we only used VGA connected monitors and so we could not see the problems. The optical quality of a HDMI connected Monitor is notably better than that of VGA connected one, furthermore the VGA connection seems to become obsolete, so we would like to stay with HDMI. What can be the reason and is there a way change the HDMI-output in to a suitable configuration? Best regards Reinhold

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X2godesktopsharing
by "BOTZ Franck (Administrateur Systèmes et Résea ux) - DDT 67/SIDSIC/Pôle Infra" 30 Sep '17

30 Sep '17

Hi ! My server run xubuntu 16.04. users can open session and work with applications. When they activate the x2godesktopsharing program, they see the icon on the systray and can activate the desktop sharing. So, then i launch the x2goclient with local desktop as profil. The session openned and i can see all x2godesktopsharing that run on the server. I select a session, ans try ton connecter with all rights. The user as a windoWs wich ask him to accept the connexion. After that, à second Windows come and want tout authentify as the admin user tout allow running applications as a different user. In auth.log, i see something like polkitd .... Any ideas ? Regards. Franck Franck Botz

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