Chapter 3: Using PuTTY | PuTTY User Manual (puttymanual)

Putty command line port option 787

If you want to create a Windows shortcut to start a PuTTY saved session, this is the option you should use: If you execute putty sessionname it will have the same effect as putty -load "sessionname".

Chapter 3: Using PuTTY

With the form, no double quotes pport required, and the sign must be the very first thing on the command line. This form of the option is deprecated. These options are equivalent to the protocol selection buttons in the Session panel of the PuTTY configuration box see section 4. If you are having trouble when making a connection, or you're simply curious, you can turn this switch on and hope to find out more about what is happening. For example, plink login. These options are equivalent to the username selection box in the Connection panel of the PuTTY configuration box see section 4. The command-line options work just like the ones in Unix ssh programs.

To forward a local port say to a remote destination say popserver. For this one you only have to pass the port number: However, the -m option expects to be given a local file name, and it will read a command from that file. With some servers particularly Unix systemsyou can even put multiple lines in this file and execute more than one command in sequence, or a whole shell script; but this is arguably an abuse, and cannot be expected to work on all servers. If you have a Telnet server running on port of a machine instead of port 23, for example: This option is equivalent to the port number control in the Session panel of the PuTTY configuration box see section 4.

This is not recommended for reasons of security. If you possibly can, we recommend you set up public-key authentication instead. See chapter 8 for details. Note that the -pw option only works when you are using the SSH protocol. Due to fundamental limitations of Telnet and Rlogin, these protocols do not support automated password authentication. These options are only meaningful if you are using SSH. See chapter 9 for general information on Pageant. These options are equivalent to the agent authentication checkbox in the Auth panel of the PuTTY configuration box see section 4. See chapter 9 for general information on Pageant, and section 9.

Note that there is a security risk involved with enabling this option; see section 9. These options are equivalent to the agent forwarding checkbox in the Auth panel of the PuTTY configuration box see section 4.

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For information on X11 forwarding, see section 3. These options are equivalent to the X11 forwarding checkbox in the X11 panel of the PuTTY configuration box see section 4. You might want lien use this option if you are only using the SSH connection for port forwarding, and your user opgion on the server does coommand have the ability portt run Puttt shell. This feature is only available in SSH protocol version 2 since the version 1 protocol assumes you will always want to optionn a shell. Instead, it will instruct the remote server to open PPutty network connection to a host name and port 78 specified by you, and treat that network connection as if it were optiin main session.

You specify a host and port as an argument to the -nc option, with a colon separating the host name from the port lnie, like this: It is available in PuTTY itself, although it por unlikely Putry be very useful in any tool other than Plink. Also, -nc uses the same server functionality as port forwarding, so it will not work optioh your server administrator has disabled port forwarding. However, Plink's built-in comjand option does not depend on the nc program opiton installed on the server. This option is only meaningful if you are using SSH. This won't work if you're not running Pageant, of course.

For general information on public-key authentication, see chapter 8. It can be a plain host name, or a host name followed by a colon and a port number. The argument to this option should be either a host key fingerprint, or an SSH-2 public key blob. You can specify this option more than once if you want to configure more than one key to be accepted. See appendix E for more information. Its argument is interpreted as a comma-separated list of configuration options, which can be as follows: Any single digit from 5 to 9 sets the number of data bits. Any other numeric string is interpreted as a baud rate.

A single lower-case letter specifies the parity: You should have been told this by the provider of your login account. See section 1. This is normal: Most servers will use the standard port numbers, so you will not need to change the port setting. If your server provides login services on a non-standard port, your system administrator should have told you which one. For example, many MUDs run Telnet service on a port other than You have no guarantee that the server is the computer you think it is. Using this technique, an attacker would be able to learn the password that guards your login account, and could then log in as if they were you and use the account for their own purposes.

These keys are created in a way that prevents one server from forging another server's key. So if you connect to a server and it sends you a different host key from the one you were expecting, PuTTY can warn you that the server may have been switched and that a spoofing attack might be in progress. Every time you connect to a server, it checks that the host key presented by the server is the same host key as it was the last time you connected. If it is not, you will see a warning, and you will have the chance to abandon your connection before you type any private information such as a password into it. So it gives the warning shown above, and asks you whether you want to trust this host key or not.

If you are connecting within a company network, you might feel that all the network users are on the same side and spoofing attacks are unlikely, so you might choose to trust the key without checking it. If you are connecting across a hostile network such as the Internetyou should check with your system administrator, perhaps by telephone or in person. Many servers have more than one host key. If the system administrator sends you more than one fingerprint, you should make sure the one PuTTY shows you is on the list, but it doesn't matter which one it is. Your system administrator should have provided you with these. Enter the username and the password, and the server should grant you access and begin your session.

If you have mistyped your password, most servers will give you several chances to get it right. If you type your username wrongly, you must close PuTTY and start again.

Many login servers, particularly Unix computers, treat upper case and lower case as different when checking your password; so if Caps Lock is on, your password will probably be refused. Most servers will print some sort of login message and then present a prompt, at which you can type commands which the server will carry out. Some servers will offer you on-line help; others might not. If you are in doubt about what to do next, consult your system administrator. When the server processes your logout command, the PuTTY window should close itself automatically. We recommend you do not do this unless the server has stopped responding to you and you cannot close the window any other way.

For extreme detail and reference purposes, chapter 4 is likely to contain more information. Once you have worked your way through that and started a session, things should be reasonably simple after that. Like most other terminal emulators, PuTTY allows you to copy and paste the text rather than having to type it again.

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Putth Also, commanv and paste uses the Windows clipboard, so that you can paste for example URLs into a web browser, or paste from a word processor or spreadsheet into your terminal session. Commane order to copy text to the clipboard, you just click the left mouse button in the terminal window, and drag to select text. When you click the right mouse button, PuTTY will read whatever is in the Windows clipboard and paste it into your session. Some remote applications can ask PuTTY to identify text that is being pasted, to avoid this sort of problem; but if your application does not, there is nothing PuTTY can do to avoid this.

If you double-click, hold down the second click, and drag the mouse, PuTTY will select a sequence of whole words.

You can adjust precisely what PuTTY considers to be part of a word; see section 4. You can also configure rectangular selection to be the default, and opiton holding 78 Alt gives the normal behaviour instead: If you have configured the middle mouse button to paste, Purty the right mouse button does this instead. Click the button on the screen, and you can pick up the nearest end of the selection and clmmand it to somewhere pott. On Windows there opton only a single selection shared with other applications, so this confusion does not arise. If vommand happens, the mouse pointer will turn into an arrow, and using the mouse to copy and paste will Puty work if you hold down Shift.

See section 4. So if something appears on the screen Puttg you want to read, but it scrolls too fast and it's gone by the time you try to look for it, you can use the scrollbar on the command side of lin window to look back up the session history and find it again. By default the last lines scrolled off the top are preserved for commxnd to look at. You can increase or decrease this value using the configuration box; Ptty section 4. PuTTY's system menu contains extra program features in addition to the Windows standard options. These extra menu commands are described below. Most of the events in the log will probably take place during session startup, but a few can occur at any point in the session, and one or two occur right at the end.

You can use the mouse to select one or more lines of the Event Log, and hit the Copy button to copy them to the clipboard. If you are reporting a bug, it's often useful to paste the contents of the Event Log into your bug report. Selecting "Duplicate Session" will start a session with precisely the same options as your current one - connecting to the same host using the same protocol, with all the same terminal settings and everything. The "Saved Sessions" submenu gives you quick access to any sets of stored session details you have previously saved. This allows you to adjust most properties of your current session.

You can change the terminal size, the font, the actions of various keypresses, the colours, and so on. Some of the options that are available in the main configuration box are not shown in the cut-down Change Settings box. These are usually options which don't make sense to change in the middle of a session for example, you can't switch from SSH to Telnet in mid-session. This might be useful, for example, if you displayed sensitive information and wanted to make sure nobody could look over your shoulder and see it.

Note that this only prevents a casual user from using the scrollbar to view the information; the text is not guaranteed not to still be in PuTTY's memory. The "Reset Terminal" option causes a full reset of the terminal emulation. A VT-series terminal is a complex piece of software and can easily get into a state where all the text printed becomes unreadable. This can happen, for example, if you accidentally output a binary file to your terminal. If this happens, selecting Reset Terminal should sort it out. When you select this, PuTTY will expand to fill the whole screen and its borders, title bar and scrollbar will disappear.

You can configure the scrollbar not to disappear in full-screen mode if you want to keep it; see section 4. When you are in full-screen mode, you can still access the system menu if you click the left mouse button in the extreme top left corner of the screen. You can do this using the "Logging" panel in the configuration box.

To begin a session log, select "Change Settings" from the system menu and go to the Logging panel. Enter a log file name, and select a logging mode. You can log all session output including the terminal control sequences, or you can just log the printable text. It depends what you want the log for. Click "Apply" and your log will be started. Later on, you can go back to the Logging panel and select "Logging turned off completely" to stop logging; then PuTTY will close the log file and you can safely read it.

There are a lot of different character sets available, so it's entirely possible for this to happen. If you click "Change Settings" and look at the "Translation" panel, you should see a large number of character sets which you can select. Now all you need is to find out which of them you want! In order to use this feature, you will need an X display server for your Windows machine, such as X-Win32 or Exceed. This will probably install itself as display number 0 on your local machine; if it doesn't, the manual for the X server should tell you what it does do.

You should then tick the "Enable X11 forwarding" box in the Tunnels panel see section 4. The "X display location" box reads localhost: If that needs changing, then change it. Now you should be able to log in to the SSH server as normal.

3.1 During your session

To check that X forwarding has been successfully negotiated during connection startup, you optoin check the PuTTY Event Log see section 3. It should say something like this: If this is a problem for you, you should mail the authors and give details. For example, you could use this to connect from your home computer to a POP-3 server on a remote machine without your POP-3 password being visible to network sniffers. In order to use port forwarding to connect from your local machine to a port on a remote server, you need to:

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