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It describes the technologies and problem in attempting to run remote graphical applications. The most common thing that students wish to do is to be able to bring up a graphical application such as XEmacs. To solve this problem we will use Xming as our X server and configure the SSH client PuTTY to request X connections get tunneled. Attempting to do so usually results in frustration.

This can result in the application reacting slow, especially over slower connections. Basically when you SSH in and run a graphical application, it has no location in which to draw the window. Cygwin also comes with an X server that can be used in place of Xming in case you still want to tunnel. To completely solve this problem you will need to both tunnel back the X connection as well as have an X server in place that can make sense of the commands

Some alternate approaches include the following: Cygwin provides a UNIX-like environment under Microsoft Windows. The official homepage for PuTTY can be found at: http://www.chiark.greenend.org.uk/~sgtatham/putty/ Specifically, the PuTTY installer can be grabbed from the following page (be sure to get the installer): http://www.chiark.greenend.org.uk/~sgtatham/putty/download.html Installing PuTTY Once This approach is not conservative with respect to bandwidth. One could also transfer the files back and forth with an application such as WinSCP, but that is a bit more tedious.

XEmacs does have a native Windows version. The problem is that the data is coming across the network to our computer, however there is nothing that is listening for this data. In the future you can simply double click the saved session to launch a session with the X connections forwarded. Going back to the phone conversation, this is analogous to having an interpreter that can interact with you and make sense of what is being said from the other side.

Xming knows how to interpret commands coming back from an X server and draw them under Microsoft Windows. However, achieving this goal is not an impossible task. Copyright © 2007 Daniel J. So if you don't see it in the system tray be sure to start it either through the start menu or a shortcut if you created one during the installation process.

It is very similar to Tera Term (installed in the GL computer labs) however it is still being actively maintained and developed. Tunneling X Connections with Xming and PuTTY This page documents how to setup the Xming X Server and PuTTY SSH client so that you can connect to a remote If you just request the connections, you will get an error similar to this: X connection to linux1.gl.umbc.edu:16.0 broken (explicit kill or server shutdown). The official homepage for current Xming development can be found at: http://www.straightrunning.com/XmingNotes/ Specifically, the Xming installer can be grabbed from sourceforge: http://sourceforge.net/projects/xming Installing Xming Once downloaded, launch the installer and follow

Another approach would be to run Linux locally. To put it another way, there is no display associated with that connection. Configuring PuTTY In order to get the remote X server to send X connections back to our X server for display we need to configure PuTTY to forward them. This is not something that you would want to attempt with anything slower than a broadband connection.

The role of the X server is to make sense of these commands and translate them into commands that can be drawn by Windows. It could also support X tunneling or SCPing data. You could either install Linux locally (you can install over or along-side of Microsoft Windows) or try booting from a live CD which doesn't touch your hard drive. Running PuTTY The following shows a typical session utilizing X forwarding.

These steps will create and save a session that is configured to connect to linux.gl.umbc.edu and forward X connections back. The Problem Usually when you connect via SSH to one of the Linux servers and try to run a graphical application (such as XEmacs) you will get the following error: Error: Typically this consists of the student connecting to linux.gl.umbc.edu by using an SSH client (often Tera Term). Note that the first screenshot should only appear the first time that you connect to a host (or if the host configuration is changed).

This is usually buried somewhere under a menu option such as "X11" or "Tunnels" (if SSHing from a Linux computer use the -X option). Xming will always need to be started before you try to accept X connections. Running an X Server to listen for connections, and Requesting the remote server to forward X connections ...we can successfully locally display graphical applications running on a remote Linux computer. By taking these two steps...

Hood Page adapted from a design by Six Shooter Media This is analogous to talking to someone over the phone, but the other person has the phone muted — you will never hear what they have to say, because nothing is So it is possible to run XEmacs locally and open a file on a remote server by using a technology such as TRAMP which can utilize SSH to open a remote This would allow you to work locally and scp data to a server when you are done.

This is analogous to calling someone over the phone, starting a conversation but instead of the other side responding in a language you know they respond in a foreign language. About Xming Xming is an open source light-weight X server for Microsoft Windows. About PuTTY PuTTY is a free telnet and SSH client which can be used to open connections to remote machines. This page explains why this is does not work "out-of-the-box".

However, this technique is not without its drawbacks. However, requesting those connections is simply not enough. A simple solution to this problem is presented and step-by-step instructions on how to accomplish displaying remote windows are detailed. Running Xming Once Xming is running, your system will be ready to accept connection from remote X servers.

The cause of this error is shown below. In order to get the instructions on how to draw the window sent back over the network to our computer the SSH client needs to be configured to request them. Background Students usually want the ability to work on programming assignments from a home computer which is often Microsoft Windows. A lot of data has pushed over the network in order to draw the windows.

Conclusion This technique can be used to tunnel back any X application giving you access to remote graphical applications. You can edit, compile and run applications directly under Windows.