x2go-dev

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5400 discussions

running in Fedora
by Léon Keijser 02 Apr '10

02 Apr '10

Hi, I'm trying to run (and eventually, package) x2goclient-gtk in Fedora (12). First of all, i can't compile it unless i run: $ sh autogen.sh $ sed -i 's:sigc++:parallel:' src/main_window.cc $ ./configure && make && make install Then after it compiles i can start the client, but it gives me an error when trying to connect to an X2go server: Connection failed Unable to write: /home/leon/.x2go/ssh/socaskpassF7TVAV The remote user is 'l.keijser' so i know it can't be a problem on the server side. Actually, when i fire up a client in a Ubuntu virtual, all works well. I have checked the permissions on the .x2go/ssh directory (they are created correctly) and even set them to 777, but with the same error. Can someone tell me what's going on? -- Léon

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SSH Key issues
by John A. Sullivan III 25 Mar '10

25 Mar '10

Hello, all. We recently recreated an X2Go Server and found we had serious ssh key issues when we tried to connect from the previously existing X2Go clients. We're still working these through so I'll list them in the order we find them. The GUI key popping up Accept Key dialogs with Yes and No options but no text. It was only when we canceled that we saw the error message about there being an old, conflicting key. By the way, we use both hashed known_host files and non-default ssh ports. This created a problem when we went to remove the offending keys in that the syntax ssh-keygen -R <server name> did not work. We needed to use ssh-keygen -R [<server name>]:<port number> (note the brackets). We then hit a problem where the X2Go Client for some reason started trying to open an SSH sessions as root. Since we use active host intrusion detection (OSSEC), the failed login attempts lock out the user and the screen stops at the X2Go logo. Oops! This was our misunderstanding of the auth.log. The problem was that our users are only defined in LDAP. We configured pam to look at pam_unix first. This tripped our HIDS and blocked our users. From our internal documentation: Now we need to fix some pam files. It is critical that the ldap modules are processed first even though that is non-standard. In the X2Go environment, many ssh sessions are fired off in quick succession. Since the pam_unix authentications fail for the LDAP users (as they are not defined locally), all the failed authentications trip the OSSEC auto-response and block the user from access to VD01. Thus, LDAP credentials MUST be processed first. This just leaves the empty dialog box. Thanks - John

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DPI problem and Gnome
by Paul van der Vlis 23 Mar '10

23 Mar '10

Hello, I found out there is a "DPI" setting in Gnome. The default setting is not always the same. You can find the setting here: system | preferences | appearance | fonts | button "details" (rough translated from Dutch in English) Not sure this solves the problem completely. With regards, Paul van der Vlis. -- http://www.vandervlis.nl/

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Fullscreen mode in Windows not working
by John A. Sullivan III 22 Mar '10

22 Mar '10

Hello, all. I've been testing X2Goclient 3.0.1-4 for Windows on two separate computers running WindowsXP. I'm seeing the same problem on both. I set the session mode to full screen and yet the session opens to some less than full screen geometry with Window decorations. I have ensured the old sessions were not running so it was not inheriting old geometry. Is this a bug or am I doing something wrong? Thanks - John

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Out of order key strokes
by John A. Sullivan III 20 Mar '10

20 Mar '10

Hello, all. I've been observing a serious issue with enough consistency that I'll report it. On highly congested links, we are noticing that keystrokes are delivered out of order. I do not know the internals of NX or even what its underlying transport is. It almost appears as if every keystroke is a packet as it is with telnet and the packets are being processed in their out of order sequence. I would think that SSH over TCP would handle packet ordering problems. When severely congested, the typing speed on the remote desktop becomes very lagged but, if one types far enough ahead, the far end of the buffer is played out of order particularly when there are the same characters close to each other (perhaps a compression bug? we have not done enough observation on that to state it dogmatically). For example, I don't know how many times today I typed something like "shared database in a complete" and had it come out "sharedd ataabse ina compleet" (in case that is displayed across a line break, there are two spaces between ataabse and ina). This can be exasperating to our clients when links are congested. It's one thing to have to wait for the display while it's another to see the display display something other than what was typed :-) Thanks - John

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Old session directories
by John A. Sullivan III 14 Mar '10

14 Mar '10

I'm noticing we are building up quite a collection of old session directories (S- and C- directories under ~/.x2go). Is there any reason why we keep these and don't delete them once the session is terminated? Thanks - John

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Working on x2goclient code
by John A. Sullivan III 14 Mar '10

14 Mar '10

Hello, all. I'm both trying to deeply understand the workings of X2Go and trying to troubleshoot a problem we are having with SSH keys after replacing an X2Go Server. >From where does one checkout the repository? I'm not that used to Berlios and it didn't jump out at me. I did download the 3.01-4 tarball and tried to run it on my default Lenny installation of KDevelop. It complains that QtDesigner is too old. It's also complaining about paths when I try to run the debugger. Any tips for getting set up to work on the Qt code? Thanks - John

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x2gosessionlimit and user limits
by John A. Sullivan III 14 Mar '10

14 Mar '10

Hello, all. We're finally starting to work our way thoroughly through the x2go scripts and were a little confused by x2gosessionlimit. Given the following logic: my $runningsessions=`x2golistsessions --all-servers`; my @sessions=split("\n",$runningsessions); my $scount=@sessions; my $strlimit=$Config->param("limit users.$uname"); if($strlimit ne "") { if($strlimit == 0) { print "0\n"; exit 0; } if($strlimit <= $scount) { print "$strlimit\n"; exit 0; } print "$strlimit\n"; exit 0; } If a user is limited to the 3 sessions and x2golistsessions returns 1, $strlimit is ne "" so we will enter the block. It is neither 0 nor <= 1 so we will print "3\n". Doesn't this cause x2gostartagent to exit with an error? LIMIT=`x2gosessionlimit` LWORD=`echo $LIMIT | awk '{print $1}'` if [ "$LWORD" == "LIMIT" ] then echo $LIMIT exit -1 fi Thanks - John

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cups-x2go for multiple X2Go Servers
by John A. Sullivan III 09 Mar '10

09 Mar '10

Hello, all. I'm stumbling through how to have a central cups server provide cups-x2go printing for multiple X2Go Servers. It seems the cups-x2go backend looks to the cups-x2go.conf file to specify the X2Go Server and only accommodates a single server. We want it to service hundreds or more. I see that the cups-x2go backend takes "cups-x2go job-id user title copies options [file]" as arguments. My current endeavor is to query the sessions database for the user to find the server but that presents the problem of when a user may have sessions on multiple servers. Is there any way to pass (even by hacking the code) the hostname of the originating X2Go Server as an argument? That would eliminate the need for the database call and make it more foolproof. Thanks - John PS - it looks like I've been able to move the x2gocleansessions processing to a central process for cleaning up hundreds of X2GoServers in a VServer 1-to-1 environment. As soon as I steer clear, I'll post the patches and documentation - John

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Single application sessions terminate with certain mouse movements
by Hein-Pieter van Braam 07 Mar '10

07 Mar '10

Hello list, I'm having a strange problem with x2go in single application mode. Whenever I start an application and I move my mouse from within the application 'up' to the window decoration the session gets terminated on the client side. I can reconnect to the program, but it will crash again if I do the same mouse movement. I have tried this with GTK programs, xterm and xcalc and the situation remains the same. My setup is Debian Sid x86_64 with windowmaker. The problem also occurs when using blackbox. Could someone perhaps tell me what I can do to debug this further? Thanks! Hein-Pieter van Braam

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