Machine accounts and passwords
Your account used to access Lab machines can be managed online.
All components use the same password, i.e. you use the same user
id and password when login into the BioHPC Lab website as well
as workstations. You can
your password online (you will need your old password) or
reset it (in this case you don't need your old password, the
new one will be e-mailed to you).
The interactive workstations can be used directly in Rhodes 625 with advance
online reservations. Access to the lab requires door code provided
to users on request.
All workstations can be accessed remotely via ssh or VNC (Linux) and Remote
Desktop (Windows). The names of workstations are listed in the top
row of the reservations table on reservations web page, fully
qualified domain names are workstationname.tc.cornell.edu
where workstationname is the name from the table. If you want to access the workstations from outside
Cornell, and you are a Cornell user, you need to set up VPN through CIT (http://www.cit.cornell.edu/services/vpn/).
Remote access is only allowed within the reserved time slot.
If you are an external user with no Cornell Netid, please
refer to this document for
instructions on how to connect from the outside. You still need to
consult remote access information
for general information.
Please refer to the remote access information
for step-by-step instructions on how to access our lab workstations from various types of
This document also covers common means for data transfer between
your local computer and workstations. It is also possible to use
Globus to transfer data and share data with other users (even
non-BioHPC Lab users) - please see
Globus at BioHPC Lab and Using Globus to Share Data for details.
It is possible to access and exchange files between external
file servers and the Lab workstations, as well as accessing
files on dedicated BioHPC file servers. Please refer to
this document for details. All users have full write access
to their home directories, they are mounted on all Lab
Access with VNC
You can access your Linux workstations using VNC protocol and
operate remotely in a graphical desktop environment. You need to go
Reservations" page, and click on "Connect VNC" for a
workstation you want to connect to. It will initialize your VNC
session. If your password is not yet stored in VNC you will be asked
first to enter it before the next page loads.
The preferred method of connecting by VNC is to use an external VNC
client. Windows users can use
Real VNC VNC
Viewer while Mac users can use
Chicken of the VNC
or Real VNC
VNC Viewer. When your session is initialized the page will
display further instructions, including port number to which you
need to connect. Launch your VNC viewer, type machine name and port
number into appropriate fields (often they are used together
machinename:portno) and connect.
You can control the resolution of your VNC window using a pull-down
just below the reservations table on �My Reservations� page.
It is also possible to use Java applet as VNC Viewer. However, very
likely you will need to lower your Java security settings to do so. It will launch a new browser
window that will load a VNC Java applet - your browser and computer
must support Java. Sometime, you will see a brower window with
"Redirecting to VNC connection" but redirection does not work. In
this case, you need to close this new browser window, and
click the "open VNC applet window" link in the previoud window to
launch the VNC applet. The applet
opens a Java application window, please click "OK" on "Connection
Details" form and then type in your password in "VNC authentication
form" (user name is blank, and it should be!). If your password is
correct a Linux desktop will open in the Java applet window. If
prompt for "Authenticate", igore it and click "Cancel".
VNC connections are persistent, i.e. when you close the VNC window
your desktop continues to run as long as your reservation is active.
You can reconnect at any time from any computer that supports Java.
NOTE: If your VNC window is plain black after reconnecting just
click anywhere inside, desktop locks out after some inactivity time
(like screensaver). If by any reason you want to restart your VNC
session (for example you killed your desktop and now cannot do
anything) just click on "Reset VNC" for your reservation on "My
How to run graphical applications (soffice, gsAssembler, etc.) while working remotely
There are two ways to run graphical applications remotely: via a VNC
connection or via an X-windows client. VNC connection (described above)
opens a graphical desktop remotely where graphical application can be
VNC is usually slower than X-windows, but it is persistent, i.e. it
keeps running even when disconnected. If you expect your graphical
software to run for many hours it is safer to use VNC, since a network
outage will kill X-windows connected program, while it will continue
running under VNC.
Using an X-windows client is a simple procedure:
1. Make sure that a suitable X-windows manager software is installed and
running on your local computer (i.e., the one you are connecting from). If you
are connecting from a Linux or Mac machine, the X-windows manager should be
already there by default. If you are connecting from a Windows PC, we recommend
that you install a free version of
and start it before connecting to the lab machines.
2. While making the ssh connection to a lab machine, remember to enable the X11 forwarding.
On Linux or Mac machines, this is done by supplying the "-X" option to the ssh command
(e.g., ssh -X cbsuwrkst2.tc.cornell.edu). On Windows machines, ssh connection
is accomplished using one of client programs, such as PuTTy.
Such clients should be configured to enable X11 forwarding. Please refer to
your client's documentation for specific instructions.
Step-by-step instructions for installation and configuration of client software
and the access procedure can be found