SSH on CS Computers
SSH Key Fingerprints
The first time you connect to a computer using ssh or similar, it
will display a key fingerprint which you should verify is correct. This
is to prevent what's called a man in the middle attack where an attacker
pretends to be the machine you're connecting to and intercepts your
password or traffic. Our fingerprints are:
RSA key fingerprints: b7:21:b5:c7:3d:3d:ee:39:9e:3a:84:62:62:f0:c5:00
ECDSA key fingerprints: d4:dd:4b:22:7a:67:a1:9c:a7:a2:df:a7:bb:d4:13:1d
RSA key fingerprints: 31:78:59:e8:94:47:46:f6:db:07:90:0f:17:30:76:5b
ECDSA key fingerprints: 5d:18:35:1d:1b:01:73:47:f5:69:e4:f9:24:d8:b2:2b
Connecting to CS Computers
For security reasons, we have turned off all commands that use clear text
passwords such as telnet (use ssh instead), ftp (use sftp instead), and rsh
(use ssh instead).
Via a windows ssh client
To download Putty, please visit:
- Click putty.exe and download it to your desktop
- Double-click on the putty.exe icon on the desktop to start putty
- In Host Name section, type in: "clic.cs.columbia.edu" or "compute.cs.columbia.edu"
- Under Protocol, be sure to check "SSH"
- Under Saved Sessions, type in "Cluster" and click Save. (From now on, you should be able to double-click
on the saved session to connect to clic.cs.columbia.edu or compute.cs.columbia.edu.)
- Click Open
- For the first time you log into clic or compute using putty, you will see a new window pop-up with
"Putty Security Alert: The server's host key is not cached in the registry. You have to guarantee
that the server is the computer you think it is. The server's key fingerprint is: ... .. .. ". Click "Yes"
- You should see "login as: " in the main window. Type in your username.
- Type in your password and you should be logged into clic or computer
Please email problems to firstname.lastname@example.org