Notes
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TeraTerm Notes |
Teraterm is a freeware Windows based terminal emulator and telnet client written by T. Teranishi. It is of better quality than many of the non-free software evaluated by PCS for similar purposes, and so has been adopted as the standard telnet client on PCS maintained PC's. In addition, it has an open design, allowing extension modules to be added in. One such module is ttssh, a secure shell (SSH) version 1 protocol extension to Teraterm. Ttssh is also freely available. Both are installed by default on PNCE maintained PC's. You can obtain both products, as well as additional information on them, here.
The secure shell protocol (SSH) is rather similar to the more familiar telnet protocol from an user's point of view. Both are simply means of logging in and getting a shell prompt on a remote (usually Unix) machine. However, as the name implies, the SSH protocol strives to eliminate a number of security issues with the older telnet protocol. In particular, SSH connections are entirely encrypted, so that if someone "eavesdrops" on your session, they will not be able to get any useful information. Telnet, in contrast, passed all information over the net as plaintext, including your password.
The telnet protocol is more widely supported on host machines than the SSH protocol, i.e. if you are trying to connect to a remote machine, it is more likely that it will allow you to telnet in than to SSH in. In addition, telnet clients are more readily available (e.g., Microsoft includes a telnet client with recent versions of their operating system). However, more and more systems have SSH clients, and more and more systems are restricting if not eliminating telnet access in favor of SSH access for security reasons. This trend is likely to become much more common due to a recent serious security hole in the telnet daemon code on many flavors of Unix.
PCS strongly recommends that all of our users use SSH over telnet where possible. All PNCE-Unix/Glue and NSCP machines will allow authorized users to SSH into them. They also have ssh clients for accessing other machines via SSH protocol.
On non-PCS maintained PC's, there should be an executable ttssh.exe after Teraterm and TTSSH are installed. This is the program you should run.
When you first launch Teraterm, a new connection window should pop up. The upper box (labeled TCP/IP) should be marked. In the box marked Host you should enter the name of the machine you wish to connect to. There is a down arrow tab, and on PNCE maintained PC's there should be a list of machines commonly connected to by members of the department already included. There also are a list of check boxes listing the service. Normally, you would only be using Telnet or SSH, and you should check off the appropriate box. The TCP port should change automatically with your choice of service, and can be ignored. (For non-PCS maintained machines: If there is no checkbox for the SSH service, your version of Teraterm does not have the SSH extension available; this could be that you did not install it, or that you ran the wrong program. You want to run ttssh.exe.)
When you hit OK or return on the New connection window, what comes next depends on the protocol being used. For the telnet protocol, you will simply see the greeting message from the machine being connected to, with a login: prompt. Enter your login name, and password when prompted, and you should get a shell as with any telnet program.
When using the SSH protocol, an SSH Authentication window will appear. Enter your username on the remote machine in the User name box, and your password for that account in the Passphrase box. Make sure the Use plain password to log in button is checked, and when you hit the OK button or hit return you will get a shell prompt on the remote machine. If the username or password was not typed correctly, the SSH Authentication box will reappear, with an Authentication failed message. Just retype them in correctly.
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