Frequently Asked Questions

  1. My VNC desktop is too small (or too large). Is there any way I can increase (or decrease) its size?

    When you run the vncstart script, provide the desired screen resolution using the -geometry option, i.e:

    scc2% vncstart -geometry 1280x900
  2. I forgot my VNC password. How can I retrieve it?
    Run the vncpasswd command on the SCC cluster to reset your VNC password.
  3. The script says I am already running a vncserver. How can I check what vncserver I am running?
    Execute the vncserver -list command on the SCC cluster. It will list all vncservers you started along with their desktop numbers.
  4. I tried to use the VNC client built into my Mac OS, but it does not work. What should I do?
    Try the RealVNC client.
  5. I connected to the gnome desktop, but I do not see a terminal window. Where is it?
    There are many ways you can start a terminal window from your gnome desktop:

    1. From the menu: Applications->System Tools->Terminal;

    2. Press a terminal icon on the ribbon on the top of your desktop;

    3. Pressing Alt+F2 keys and enter xterm in the command dialog box;

    4. Press the right mouse button and select “terminal” from the pop-up menu;

  6. How can I cut and paste text between my gnome desktop and my local machine?
    The VNC connection allows for copying and pasting ASCII text between your local machine and your gnome desktop. You can use Ctrl+Insert to copy the text to the clipboard and Shift+Insert to paste it.
  7. There are many log files in the .vnc subdirectory of my home directory. They take up a lot of space. Can I delete them?
    The VNC server creates a log file every time you start it. Eventually these files may take a lot of space. You can delete old log files by running the rm *.log command.
  8. How secure is VNC connection?
    SSH Tunneling required for our VNC connections strongly encrypts all traffic between your local machine and the SCC server. SSH also compresses the encrypted data making the connection even faster which is especially useful while running VNC over slow links. It is also very important that you do not use your Kerberos and/or local SCF password as your VNC password.
  9. I do not see my application (such as MATLAB, ENVI, RStudio, etc…) listed in the Applications menu. How do I start it?
    All programs on the SCC should be started from the terminal window within your Gnome desktop session (launched by selecting Application->System Tools->Terminal). If you plan to run the program for more than 15 minutes of CPU time, start an interactive job (qrsh) in your terminal window and then start your program on the compute node you are assigned to.
  10. I have a question not listed here. Who do I contact?
    For questions or to report problems, please send email to