This means you can download, install, run and share the program freely without any restrictions. PuTTY is released under the MIT License for the Windows operating system from SSH/telnet clients.

X11 forwarding: Securely forwards X11 sessions over SSH.

Tunnelling: Supports port forwarding through SSH.

Terminal emulation: VT100, VT102, VT220 and ANSI terminal emulation.

Security: Includes support for public-key authentication and Kerberos.

Scripting: Supports scripting to automate tasks.

SSH: Supports SSH, Telnet and rlogin protocols.

Proxy support: Supports HTTP, SOCKS and Telnet proxies.

Printing: Supports local and remote printing.

Keyboard shortcuts: Allows custom keyboard shortcuts.

File transfer: Supports SFTP, SCP and FTP protocols.

Customization: Offers an extensive range of customization options.

Configuration: Offers a wide range of configuration options.

It supports both SSH, SSH2 and an impressive list of other protocols which makes it a must-have for anybody needed to interact with remote systems be it Linux, BSD or even with other devices connected to a network like an Android phone. PuTTY is highly recommended for any administrator or anybody who needs an SSH or Telnet client quick. It comes with support for Raw, Telnet, Rlogin, SSH and Serial connection types with support for custom, non-standard ports. Additionally, it supports both IPv4 and IPv6 protocols. The client supports all types of standard encryption keys, secure FTP and SCP and X11 forwarding. The main settings window for PuTTY include a number of useful options like terminal size (columns and rows), support for resizing terminal window, custom sounds and control of cursor selection like copy and paste with mouse clicks. The display of the terminal window can be customized in several aspects like the color and font, number of lines of history to save in a current session, selection options and more. These options can be saved for future connections as a saved session. Options for this excellent client include SSH authentication options including cipher control, general TCP/IP settings and more. As a freeware application, it is also extremely portable. PuTTY is by far the most lightweight and handy SSH client available for free. Highly flexible SSH client with Xterm terminal emulation and support for Rlogin, SFTP, Telnet and Serial connections.

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