After creating your account, you can log in to TSUBAME as described in this page.

In a Nutshell

Using TSUBAME2 requires you to log in to the machine with Secure Shell (SSH), which is a method to connect to remote serves securely. Here's the necessary information to do so:

Login nodes login-t2.g.gsic.titech.ac.jp
User name Your TSUBAME account name
Password Your TSUBAME account password
Authentication method Password or public key. Only public key is allowed when accessing from outside the campus network.

Note that on TSUBAME1, password login was allowed even from outside the university network, but it is now disabled. Use the public key login instead as described below. 

Detailed Procedure

1. Installing SSH Clients

Windows user need to install SSH client software unless already done. Popular free clients include:

Any other software compatible with OpenSSH can be used. Cygwinのインストール方法はこちら

Standard Mac and Linux machines have OpenSSH installed by default. You can check your machine by firing up a command shell and typing "ssh". You would get a response like below with minor differences if installed:

$ ssh
usage: ssh [-1246AaCfgKkMNnqsTtVvXxYy] [-b bind_address] [-c cipher_spec]
           [-D [bind_address:]port] [-e escape_char] [-F configfile]
           [-i identity_file] [-L [bind_address:]port:host:hostport]
           [-l login_name] [-m mac_spec] [-O ctl_cmd] [-o option] [-p port]
           [-R [bind_address:]port:host:hostport] [-S ctl_path]
           [-w local_tun[:remote_tun]] [user@]hostname [command]

If not installed, see the operation manual for your machine to find how to install OpenSSH.

2. Checking network connectivity

Next, make sure the network from your local machine to TSUBAME is reachable as follows. Command "e;ping"e; is what you should for this purpose and available on most computers.


C:> ping login-t2.g.gsic.titech.ac.jp


$ ping -c 3 login-t2.g.gsic.titech.ac.jp

If you see messages like "host is not found", "request is timed out", or no message at all, your machine to TSUBAME is not likely to be network reachable. If that's the case, then:

  • It can be temporary failures, so try again.
  • If the problem persists, make sure your computer is actually connected to the internet. If you see this web page from the machine, it should be ok.
  • Even if your machine is correctly connected to the internet but the ping command still fails, it may be because TSUBAME is under maintenance or system failures. Check our announcements at the top page of this web site and our GSIC Newsletter email.

3. Connecting from the university network

Connect to the login node using the SSH client. On Mac/Linux, use the OpenSSH command from a terminal window as follows:

$ ssh -l your-account-name login-t2.g.gsic.titech.ac.jp

Windows clients can be used similarly with the information listed above, including your account name, remote host name, and your password.

Note that this method is only available for the case connecting from the university network; see below othersie.

4. Connecting from outside the campus network

This is necessary only when accessing from outside the university network, although it works and is more secure even when you use TSUBAME solely at the Tokyo Tech campuses.

Fore security reasons, accessing TSUBAME2 from outside the campus network requires the SSH authentication method based on public key cryptography, for which you need to create a pair of keys and to upload one of the pair to TSUBAME. Here's how:

  1. Generating a key pair
    On Mac/Linux, type "e;ssh-keygen"e; on terminal. Putty has a separate program called Puttygen for generating key pairs in the OpenSSH key format. With TeraTerm, click "SSH KeyGenerator" from the Setup menu. You may have options to select encryption algorithms such as RSA and DSA; both of which should work with TSUBAME. If you already have a key pair, you do not need to create a new one. You can also set a password, which is optional.


  2. Uploading the publick key
    The key pair consists of public and private keys. The public key needs to be uploaded to TSUBAME, while the private one remains on your machine. To do so, access the TSUBAME portal with you TSUBAME account, and go to the SSH key upload page. The public key to upload is located under ~/.ssh directory on Mac and Linux with its file name being "e;id_rsa.pub"e; or "id_dsa.pub"e; by default. Putty and TeraTerm users should be able to find the public key file from the key generation dialog.


Your public key is now uploaded and configured on TSUBAME. Putty and TerTerm users would need to configure your clients to use the private key to do authentication when accessing the login machine. Mac and Linux users should not need extra configurations.

At this stage, if everything is correctly configured, you should be able to log in to TSUBAME with the key pair even from outside the campus network. You must type your key password if necessary. If logging in fails, something is not set correctly; see below for troubleshooting.


When you have a problem to access TSUBAME, please check your network connectivity as described above. If your problem occurs even though your machine can reach the machine, contact our support line from here. Please make sure to include the following information when contacting us so that we can resolve your problem quickly.

  • Your TSUBAME account name
  • Your computer's operating system name (e.g., Windows, Mac, or Linux), SSH client name and version
  • Whetehr you can log in from the campus network with the password
  • Whetehr you can log in from the campus network with the public key
  • Any error messages to diagnose the problem. On Mac/Linux, you can make the client display very detailed messages by enabling a verbose output option. Retry with "-v" option in the command line and copy and paste the output when contacting us.