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Remote Access

How to access our computer systems from outside the Linux Lab

NOTE: As of Fall 2016, we have redeployed a new system. We are in the process of updating our documentation pages, so some of the following may be changing.

You can access your files and all of our software on the linux cluster through hopper.slu.edu using one of several methods 

Note: Although a connection to hopper.slu.edu should be used for most access, once connected to hopper, individual lab machines can be accessed using the addresses linuxlab1 through linuxlab14.

Secure Shell (SSH)

Provides text only shell access that works well over any internet connections.  The connection is fully encrypted for privacy.

Windows:
PuTTY is a free SSH client for Windows and can be downloaded at http://www.putty.org.  It is already installed on all of SLU's windows laboratories and classrooms.
Macintosh or Linux:
An SSH client is included with every Mac and Linux system.  Start up a terminal window and type ssh USER@hopper.slu.edu where USER is your username.

NX Client

NX provides graphical login to the Linux desktop.  This desktop environment is identical to the one in the Linux Lab.  The client software is available in Ritter Hall 236 and 323 and in other computer classrooms on campus.  The client software is free and runs on Windows, Mac and Linux.  You can download the "NoMachine Enterprise Client" from https://www.nomachine.com/download-enterprise.

As of 2014, NoMachine is only supporting version 4 of their NX client software (although our server will still support older clients, we recommend installing the newest version to take advantage of all of the new features).

Note:  network connections are subject to the restrictions of your Internet Service Provider as well as any local Firewall software on your machine.  In some cases (such as with sluguest wireless), this may result in traffic on port 22 being blocked, making both ssh and NX connections to hopper impossible.

Instructions for configuring the latest NX software follow.

  1. Upon startup of the software, the following three "splash" screens are displayed (although you may select the "Don't show this message again" option if you'd like). 
    splash1.jpg
    splash2.jpg
    splash3.jpg


  2. You should next be presented with the "Recent connections" screen. If this is your first time using the software, you will want to create a new connection by clicking on the icon with the popup label "Add a computer" (the icon is a monitor with a plus sign in the top-right corner).connections.jpg
    To create a connection, enter the following,

    • Name: hopper
    • Host: hopper.slu.edu
    • Protocol: SSH
    • Port: 22
      createconnection.jpg

      and then click Continue and then Connect.

       

    Note: If this is not your first time using NX and you have previously created a connection, when reaching the "Recent connections" page, you should see an entry for that connection that you may select and hit "Connect".
    recent.jpg

  3. You should next be at a screen asking for your username and password credentials. Enter those credentials for hopper and click "OK"
    credentials.jpg

  4. If successful, you will next see a screen presenting you with a choice of desktops. If this is your first time, you will need to "create a new virtual desktop" by either clicking on the icon that is a rectangle with a plus sign at the top right, or clicking on the "New virtual desktop" text below.
    nodesktops.jpg
    You will then be presented with a choice of desktop styles. You should choose "Create a new KDE virtual desktop" and click Continue.

  5. You are getting close! After successfully logging in, NX will present three additional splash menus (again, you have the option of selecting "Don't show this message again" while clicking through). Finally, you should see the remote desktop for your hopper account and be ready to go. There may be a NoMachine status window on the desktop. You may simply click "Done" which causes that to be iconified.success.jpg

 

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