Re: 'GLX missing on display' Problems
On Fri, 30 Apr 2004 [EMAIL PROTECTED] wrote: On 28 Apr, Harold L Hunt II wrote: http://x.cygwin.com/docs/faq/cygwin-x-faq.html#q-ssh-no-x11forwarding Interesting info, though it confuses me a little. Where it says: It is easiest to just override trusted X11 forwarding by passing -Y to ssh in place of -X. The -Y does the same thing as -X, but it enables trusted X11 forwarding for the current connection. does it mean to say It is easiest to just override X11 forwarding...? Otherwise it seems to be saying you can override trusted X forwarding with trusted X forwarding. When it says OpenSSH 3.8 enables trusted X11 forwarding by default when connecting to an ssh server that supports trusted X11 forwarding., does it mean that overrides the setting in the /etc/ssh_config file? In other words, which default is the most default? Correct is: OpenSSH 3.8 now connects as _un_trusted client by default. The prior versions always connected as trusted (normal) clients. Actually it should read: OpenSSH 3.8 uses untrusted X11 forwarding by default when connecting to an ssh server that supports untrusted X11 forwarding. Most ssh servers for GNU/Linux are versions of OpenSSH that do support untrusted X11 forwarding, so using OpenSSH 3.8 from Cygwin will result in a connection that uses untrusted X11 forwarding by default. You will quickly notice that this is the case if most of your X applications are now killed when you try to copy and paste or if xdpyinfo returns only a fraction of the supported extensions that it does if run locally. It is easiest to just override untrusted X11 forwarding by passing -Y to ssh in place of -X. The -Y does the same thing as -X, but it enables trusted X11 forwarding for the current connection. What happens if your config file has both ForwardX11 yes and ForwardX11Trusted yes? Which is the default then? Is it bad to have both? Is it bad to have one set to yes and the other to no? I don't know. Try it. Apologies if these are stupid questions. I notice that I do have openssh 3.8 installed, and also note that the man page mentions ForwardX11Trusted in only one place, with no explanation, and the section on X11 and TCP forwarding mentions only ForwardX11 and the -X and -x options, not the -Y. So I couldn't get answers to my questions there. (This is true in the latest Cygwin, as of a day or so ago.) bye ago -- [EMAIL PROTECTED] http://www.gotti.org ICQ: 126018723
Re: 'GLX missing on display' Problems
On 28 Apr, Harold L Hunt II wrote: http://x.cygwin.com/docs/faq/cygwin-x-faq.html#q-ssh-no-x11forwarding Interesting info, though it confuses me a little. Where it says: It is easiest to just override trusted X11 forwarding by passing -Y to ssh in place of -X. The -Y does the same thing as -X, but it enables trusted X11 forwarding for the current connection. does it mean to say It is easiest to just override X11 forwarding...? Otherwise it seems to be saying you can override trusted X forwarding with trusted X forwarding. When it says OpenSSH 3.8 enables trusted X11 forwarding by default when connecting to an ssh server that supports trusted X11 forwarding., does it mean that overrides the setting in the /etc/ssh_config file? In other words, which default is the most default? What happens if your config file has both ForwardX11 yes and ForwardX11Trusted yes? Which is the default then? Is it bad to have both? Is it bad to have one set to yes and the other to no? Apologies if these are stupid questions. I notice that I do have openssh 3.8 installed, and also note that the man page mentions ForwardX11Trusted in only one place, with no explanation, and the section on X11 and TCP forwarding mentions only ForwardX11 and the -X and -x options, not the -Y. So I couldn't get answers to my questions there. (This is true in the latest Cygwin, as of a day or so ago.) Regards, luke
Re: 'GLX missing on display' Problems
Wrong list: http://cygwin.com/lists.html This is a Cygwin/X specific question. Redirecting... On Wed, 28 Apr 2004, eti1 wrote: I use cygwin from home (on a Windows box) to ssh into my machine at work (Linux box). I get the following error when I try to run programs that use opengl libs for displaying: [EMAIL PROTECTED] cubit90]$ glxgears Xlib: extension GLX missing on display localhost:10.0. Error: couldn't get an RGB, Double-buffered visual When I ssh, I use the -X option so that graphics get forwarded to my local machine. I am aware that this error is usually manifested because opengl libs are not installed on the local machine, but I know I have them on my local machine because if I go a 'glxgears' before ssh-ing the gears graphics window displays just fine. It appears that after ssh-ing into my work machine, display information is lost. What is very troubling with this problem is that sometimes the problem altogether disappears. For example, if I ssh into my work machine and let the terminal sit for a while, it sometimes works, sometimes not. Other times after ssh-ing in, if I edit a file with vim I can run glxgears after, but not always. Nothing is reproducable to get it to work. But once it starts displaying, it usually doesn't stop. I tried a complete uninstall/reinstall of cygwin but it didn't do anything. Help! --Corey Please also see: Problem reports: http://cygwin.com/problems.html We need more information to help you. -- Brian Ford Senior Realtime Software Engineer VITAL - Visual Simulation Systems FlightSafety International the best safety device in any aircraft is a well-trained pilot...
Re: 'GLX missing on display' Problems
http://x.cygwin.com/docs/faq/cygwin-x-faq.html#q-ssh-no-x11forwarding Brian Ford wrote: Wrong list: http://cygwin.com/lists.html This is a Cygwin/X specific question. Redirecting... On Wed, 28 Apr 2004, eti1 wrote: I use cygwin from home (on a Windows box) to ssh into my machine at work (Linux box). I get the following error when I try to run programs that use opengl libs for displaying: [EMAIL PROTECTED] cubit90]$ glxgears Xlib: extension GLX missing on display localhost:10.0. Error: couldn't get an RGB, Double-buffered visual When I ssh, I use the -X option so that graphics get forwarded to my local machine. I am aware that this error is usually manifested because opengl libs are not installed on the local machine, but I know I have them on my local machine because if I go a 'glxgears' before ssh-ing the gears graphics window displays just fine. It appears that after ssh-ing into my work machine, display information is lost. What is very troubling with this problem is that sometimes the problem altogether disappears. For example, if I ssh into my work machine and let the terminal sit for a while, it sometimes works, sometimes not. Other times after ssh-ing in, if I edit a file with vim I can run glxgears after, but not always. Nothing is reproducable to get it to work. But once it starts displaying, it usually doesn't stop. I tried a complete uninstall/reinstall of cygwin but it didn't do anything. Help! --Corey Please also see: Problem reports: http://cygwin.com/problems.html We need more information to help you.
