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JoliPuTTY User Manual

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JoliPuTTY is a playful fork of PuTTY, the free (MIT-licensed) Windows Telnet and SSH client, which gives PuTTY a modern WinUI 3 look on Windows 11, with tabs, split panes and a redesigned configuration window. This manual documents JoliPuTTY, and PuTTY's companion utilities PSCP, PSFTP, Plink, Pageant and PuTTYgen.

chapter 2 describes what JoliPuTTY does differently from PuTTY. The rest of the manual is PuTTY's own: it still says ‘PuTTY’, and describes PuTTY's configuration dialog box, whose settings JoliPuTTY keeps, although some of them are on different pages (see section 2.5.7).

Like PuTTY's, this manual is about the Windows versions of the tools. JoliPuTTY doesn't change the Unix version of PuTTY.

JoliPuTTY is an independent project, and is not affiliated with the PuTTY project. It is provided as is, without any warranty.

This manual is copyright 1997-2026 Simon Tatham, with portions (the preface and chapter 2) copyright 2026 Sylvain Cresto. All rights reserved. You may distribute this documentation under the MIT licence. See appendix D for the licence text in full.

• Chapter 1: Introduction to PuTTY
  • 1.1 What are SSH, Telnet, Rlogin, and SUPDUP?
  • 1.2 How do SSH, Telnet, Rlogin, and SUPDUP differ?
• Chapter 2: What's new in JoliPuTTY
  • 2.1 Installing and running JoliPuTTY
  • 2.2 The main window
  • 2.3 Pools of copied text
  • 2.4 Keyboard shortcuts
  • 2.5 The configuration window
  • 2.6 What servers see
• Chapter 3: Getting started with PuTTY
  • 3.1 Starting a session
  • 3.2 Verifying the host key (SSH only)
  • 3.3 Logging in
  • 3.4 After logging in
  • 3.5 Logging out
• Chapter 4: Using PuTTY
  • 4.1 During your session
  • 4.2 Creating a log file of your session
  • 4.3 Altering your character set configuration
  • 4.4 Using X11 forwarding in SSH
  • 4.5 Using port forwarding in SSH
  • 4.6 Connecting to a local serial line
  • 4.7 Making raw TCP connections
  • 4.8 Connecting using the Telnet protocol
  • 4.9 Connecting using the Rlogin protocol
  • 4.10 Connecting using the SUPDUP protocol
  • 4.11 The PuTTY command line
• Chapter 5: Configuring PuTTY
  • 5.1 The Session panel
  • 5.2 The Logging panel
  • 5.3 The Terminal panel
  • 5.4 The Keyboard panel
  • 5.5 The Bell panel
  • 5.6 The Features panel
  • 5.7 The Window panel
  • 5.8 The Appearance panel
  • 5.9 The Behaviour panel
  • 5.10 The Translation panel
  • 5.11 The Selection panel
  • 5.12 The Copy panel
  • 5.13 The Colours panel
  • 5.14 The Connection panel
  • 5.15 The Data panel
  • 5.16 The Proxy panel
  • 5.17 The SSH panel
  • 5.18 The Kex panel
  • 5.19 The Host Keys panel
  • 5.20 The Cipher panel
  • 5.21 The Auth panel
  • 5.22 The Credentials panel
  • 5.23 The GSSAPI panel
  • 5.24 The TTY panel
  • 5.25 The X11 panel
  • 5.26 The Tunnels panel
  • 5.27 The Bugs and More Bugs panels
  • 5.28 The ‘Bare ssh-connection’ protocol
  • 5.29 The Serial panel
  • 5.30 The Telnet panel
  • 5.31 The Rlogin panel
  • 5.32 The SUPDUP panel
  • 5.33 Storing configuration in a file
• Chapter 6: Using PSCP to transfer files securely
  • 6.1 Starting PSCP
  • 6.2 PSCP Usage
• Chapter 7: Using PSFTP to transfer files securely
  • 7.1 Starting PSFTP
  • 7.2 Running PSFTP
  • 7.3 Using public key authentication with PSFTP
• Chapter 8: Using the command-line connection tool Plink
  • 8.1 Starting Plink
  • 8.2 Using Plink
  • 8.3 Using Plink in batch files and scripts
  • 8.4 Using Plink with Git
  • 8.5 Using Plink with CVS
  • 8.6 Using Plink with WinCVS
• Chapter 9: Using public keys for SSH authentication
  • 9.1 Public key authentication - an introduction
  • 9.2 Using PuTTYgen, the PuTTY key generator
  • 9.3 Getting ready for public key authentication
• Chapter 10: Using Pageant for authentication
  • 10.1 Getting started with Pageant
  • 10.2 The Pageant main window
  • 10.3 The Pageant command line
  • 10.4 Using agent forwarding
  • 10.5 Loading keys without decrypting them
  • 10.6 Security considerations
• Chapter 11: Common error messages
  • 11.1 ‘The host key is not cached for this server’
  • 11.2 ‘WARNING - POTENTIAL SECURITY BREACH!’
  • 11.3 ‘This server presented a certified host key which was signed by a different certification authority ...’
  • 11.4 ‘SSH protocol version 2 required by our configuration but remote only provides (old, insecure) SSH-1’
  • 11.5 ‘The first cipher supported by the server is ... below the configured warning threshold’
  • 11.6 ‘Remote side sent disconnect message type 2 (protocol error): "Too many authentication failures for root"’
  • 11.7 ‘Internal error’, ‘Internal fault’, ‘Assertion failed’
  • 11.8 ‘Unable to use key file’, ‘Couldn't load private key’, ‘Couldn't load this key’
  • 11.9 ‘Server refused our key’, ‘Server refused our public key’, ‘Key refused’
  • 11.10 ‘Access denied’, ‘Authentication refused’
  • 11.11 ‘No supported authentication methods available’
  • 11.12 ‘Incorrect MAC received on packet’ or ‘Incorrect CRC received on packet’
  • 11.13 ‘Incoming packet was garbled on decryption’
  • 11.14 ‘PuTTY X11 proxy: various errors’
  • 11.15 ‘Network error: Software caused connection abort’
  • 11.16 ‘Network error: Connection reset by peer’
  • 11.17 ‘Network error: Connection refused’
  • 11.18 ‘Network error: Connection timed out’
  • 11.19 ‘Network error: Cannot assign requested address’
• Appendix A: PuTTY FAQ
  • A.1 Introduction
  • A.2 Features supported in PuTTY
  • A.3 Ports to other operating systems
  • A.4 Embedding PuTTY in other programs
  • A.5 Details of PuTTY's operation
  • A.6 HOWTO questions
  • A.7 Troubleshooting
  • A.8 Security questions
  • A.9 Administrative questions
  • A.10 Miscellaneous questions
• Appendix B: Feedback and bug reporting
  • B.1 General guidelines
  • B.2 Reporting bugs
  • B.3 Reporting security vulnerabilities
  • B.4 Requesting extra features
  • B.5 Requesting features that have already been requested
  • B.6 Contributing to the code
  • B.7 Workarounds for SSH server bugs
  • B.8 Support requests
  • B.9 Web server administration
  • B.10 Asking permission for things
  • B.11 Mirroring the PuTTY web site
  • B.12 Praise and compliments
  • B.13 E-mail address
• Appendix C: PPK file format
  • C.1 Overview
  • C.2 Outer layer
  • C.3 Private key encodings
  • C.4 Key derivation
  • C.5 Older versions of the PPK format
• Appendix D: PuTTY Licence
• Appendix E: PuTTY hacking guide
  • E.1 Cross-OS portability
  • E.2 Multiple backends treated equally
  • E.3 Multiple sessions per process on some platforms
  • E.4 C, not C++
  • E.5 Security-conscious coding
  • E.6 Independence of specific compiler
  • E.7 Small code size
  • E.8 Single-threaded code
  • E.9 Keystrokes sent to the server wherever possible
  • E.10 640×480 friendliness in configuration panels
  • E.11 Coroutines in protocol code
  • E.12 Explicit vtable structures to implement traits
  • E.13 Do as we say, not as we do
• Appendix F: PuTTY download keys and signatures
  • F.1 Public keys
  • F.2 Security details
  • F.3 Key rollover
• Appendix G: SSH-2 names specified for PuTTY
  • G.1 Connection protocol channel request names
  • G.2 Key exchange method names
  • G.3 Encryption algorithm names
  • G.4 Agent extension request names
• Appendix H: PuTTY authentication plugin protocol
  • H.1 Requirements
  • H.2 Transport and configuration
  • H.3 Data formats and marshalling
  • H.4 Protocol versioning
  • H.5 Overview and sequence of events
  • H.6 Message formats
  • H.7 References
• Appendix I: PuTTY privacy considerations
  • I.1 Information that PuTTY stores locally
  • I.2 Sending information over the network
  • I.3 Configuration
  • I.4 Modified versions of PuTTY
  • I.5 JoliPuTTY
• Index

JoliPuTTY is an independent project, based on PuTTY, and not affiliated with the PuTTY project. To report a problem with JoliPuTTY, or with this manual, see its issues page.