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README in the source distribution. If this happened, I confidently predict that somebody would do that, and that some kind of a free PuTTY would continue to be developed. PuTTY opens a window. PuTTY executables run on versions of Windows from XP onwards, up to and including Windows 10; and we know of no reason why PuTTY should not continue to work on future versions of Windows. PuTTY saved sessions, then that IT department can probably also tell you something about what commands you can type during those sessions. SMB and Windows Terminal Services have found that doing so no longer works since they upgraded to WinXP SP2. How can I clean up after it? If you want to be sure your donation is going towards something worthwhile, ask us first.

We cannot afford to be sued. Some users want to generate a large number of SSH keys on Unix and then copy them all into PuTTY, and the Unix PuTTYgen should allow them to automate that conversion process. So you can work on the Unix machine as if you were sitting at its console, while actually sitting somewhere else. How can I donate to PuTTY development? This is still true of SCP. PuTTY web site, we might be interested in linking to you from our Mirrors page. Can you sign anything for us? Does PuTTY support storing its settings in a disk file?

What commands can I type into my PuTTY terminal window? It is designed behaviour that PuTTY should have the ability to adjust the window title on instructions from the server. My keyboard stops working once PuTTY displays the password prompt. If we opened it up for everybody to subscribe to, it would turn into something more like a newsgroup and we would be completely overwhelmed by the volume of traffic. Visual C at least have stopped being backwards compatible to Win32s. Financial liability is intrinsically linked to selling your product for money. During the course of a session, PuTTY potentially uses all the colours listed in the Colours panel.

And Pageant spends most of its time inactive. Will there be a port to EPOC? Only if the content of your web page is of definite direct interest to PuTTY users. PuTTY will try to determine automatically whether to enable them or not, based on which protocol you have selected and also based on hints from the server. This is almost always caused by your login scripts on the server generating output. See MS Knowledge Base article 158474 for more information. VB integration being anywhere other than the very bottom of our priority list. If you have software based on PuTTY, or specifically designed to interoperate with PuTTY, or in some other way of genuine interest to PuTTY users, then we will probably be happy to add a link to you on our Links page.

OP, can this be done? SSH servers in embedded devices, network appliances, and the like seem to disproportionately have this bug. PayPal, talk to us; we can probably arrange some alternative means. See chapter 5 in the documentation for more details. Adding an option to turn host key checking off completely is the wrong solution and we will not do it. Normally this will be something well under 100 bytes. PuTTY we know about here is the name of a computer program. Unix port to be the right thing for everybody. When I change some terminal settings, nothing happens.

We cannot help with questions of this sort. Some people who ask PuTTY to listen on localhost addresses other than 127. By default, PuTTY announces its terminal type to the server as xterm. These protocols are all used to run a remote session on a computer, over a network. If someone else wants to set up a mailing list or other forum for PuTTY users to help each other with common problems, that would be fine with us, though the PuTTY team would almost certainly not have the time to read it. PuTTY web site being exactly where it is. Until recently, this was a limitation of the file transfer protocols: the SCP and SFTP protocols had no notion of transferring a file in anything other than binary mode. Free software fundamentally does not work on the basis of financial guarantees.

PuTTY did not support this sequence. There are two reasons why PuTTY is not analogous to a physical lock in this context. If you run it without arguments, it will simply print a help message and terminate. My PuTTY sessions unexpectedly close after they are idle for a while. You can try to combat this by telling PuTTY to send keepalives: packets of data which have no effect on the actual session, but which reassure the router or firewall that the network connection is still active and worth remembering about. To paste the clipboard contents into a PuTTY window, by default you click the right mouse button.

If this happens just while the connection is starting up, this often indicates that for some reason the client and server have failed to establish a session encryption key. If PSCP is using the traditional SCP protocol, this is confusing. It depends on whether you trust that PC. Will there be a port to the iPhone? Will there be a port to the Mac? PuTTY is instructed by the server to display green text. Think of PuTTY as being a bit like a telephone. PSCP, PSFTP and Plink? Is there an option to turn off the annoying host key prompts?

Recent versions of PuTTY automatically initiate repeat key exchange once per hour, to improve session security. Links page of our website. Your guarantee of the software functioning correctly is simply that you have the source code and can check it before you use it. Is PuTTY a port of OpenSSH, or based on OpenSSH or OpenSSL? This FAQ is published on the PuTTY web site, and also provided as an appendix in the manual. Those annoying host key prompts are the whole point of SSH. This is simply because the PuTTY development project has no income out of which to satisfy that liability, or pay legal costs, should it become necessary. FIPS certification for PuTTY? Why can PuTTYgen load my key but not PuTTY? Where does PuTTY store its data?

If anyone told you we had an Android port, or an iOS port, or any other port of PuTTY, they were mistaken. This is now deprecated and may be removed at some point. PC, you might want to clean this information up when you leave. See also the wishlist entry. No offence to SourceForge; I think they do a wonderful job. It will only take effect once you reset the terminal.

For most purposes, PuTTY can be considered to be an xterm terminal. Putty World, at www. One reasonably not difficult way to do this on a Unix system is to type the command cat, and then press the function key. Where can I buy silly putty? If your content is unrelated, or only tangentially related, to PuTTY, then the link would simply be advertising for you. If you have a problem with this, you can reconfigure it to say something else; vt220 might help if you have trouble. Each one has its own collection of binaries, and its own collection of checksums files to go with them. Can you write us a formal notice of permission to use PuTTY?

Then, only send out these mass mailings to the former. Would you like me to register you a nicer domain name? How can I use PuTTY to make an SSH connection from within another program? PSFTP may implement this proposal. We do not recommend it. The code is available if anyone else wants to try it. You need to read the manuals, or ask the administrator, of the computer you have connected to. If you want to keep your money, please do keep it. If your client or server machine is slow, you may experience this as a delay of anything up to thirty seconds or so. This will cause the connection to be rudely cut off when contact is resumed. We already have some, thanks. PuTTY core development team. The current draft protocol spec of SFTP proposes a means of implementing ASCII transfer. SSH and Telnet client.

This is what CVS for Windows does, for example. PuTTY is almost completely composed of code written from scratch for PuTTY. This is a Windows problem, not a PuTTY problem. But the PuTTY maintainer team does not administer any server you are likely to be connecting to, and cannot help you with questions of this type. Would you like free web hosting for the PuTTY web site? This is not a bug in PSFTP. Can PSCP or PSFTP transfer files in ASCII mode? PuTTY fails to start up. We estimate that we have literally millions of users, and we absolutely would not have time to go round signing specific agreements with every one of them.

This is not a question you should be asking us. The SCP backend did not suffer from this performance issue because SCP is a much simpler protocol. What does PuTTY leave on a system? Similarly, some people have asked us for FIPS certification of the PuTTY tools. You use the left mouse button to select text in the PuTTY window. Is it safe for me to download PuTTY and use it on a public PC? This is impossible for PSCP, or any other SCP client, to work around. PuTTY is a security product, and as such it is particularly important to guard the code and the web site against unauthorised modifications which might introduce subtle security flaws. The purpose of the Colours panel is to let you adjust the appearance of all the colours.

Terminal Services in the first place. PuTTY is a client program for the SSH, Telnet and Rlogin network protocols. That way, you retain the important feature of host key checking: the right key will be accepted and the wrong ones will not. How can I create a Windows shortcut to start a particular saved session directly? SFTP backend to queue several blocks of data rather than waiting for an acknowledgement for each. That insignificant host key prompt really does make that much difference. Copy and paste works similarly to the X Window System. How can I start an SSH session straight from the command line?

Writing a binary file to your terminal runs the risk of sending the same control sequence by accident, and cause unexpected changes in the window title. PuTTY implements the client end of that session: the end at which the session is displayed, rather than the end at which it runs. Any other meaning is in the eye of the beholder. Wishlist page, and see if you can find the feature there. Then, anything you type into that window is sent straight to the Unix machine, and everything the Unix machine sends back is displayed in the window. The short answer is not to put the PuTTY executables in that location.

How do I use PSCP to copy a file whose name has spaces in? SYSTEM32 at all, because the File System Redirector arranges that the running program sees the appropriate kind of binaries in SYSTEM32. We once did some work on such a port, but it only reached an early stage, and certainly not a useful one. One very nice effect of the Google ranking mechanism is that by and large, the most popular web sites get the highest rankings. There is no program safe enough that you can run it on an actively malicious PC and get away with typing passwords into it. This almost always happens because the startup scripts in your account on the server machine are generating output. Similarly, the development snapshot binaries go with the development snapshot checksums, and so on. SSH supports public key authentication, which is more flexible and more secure. This is stored by default in a file called PUTTY. Will you write an SSH server for the PuTTY suite, to go with the client? PuTTY is a communications tool, for making connections to other computers.

PuTTY Keyboard panel, you may need to mail the PuTTY maintainers and ask. If PSCP fails in this way, then all other SCP clients are likely to fail in exactly the same way. Therefore what we really need to know is what sequence the application is expecting. PuTTY saved session, and then use the name of the saved session on the command line in place of a hostname. Can you sign an agreement indemnifying us against security problems in PuTTY? PuTTY expects to see is the length of an SSH message. What ports of PuTTY exist? You can also change the default settings that are used for new sessions.

US bureaucracy to investigate any further. Is the SSH or Telnet code available as a DLL? We have no plans to write such a port ourselves; none of us has an iPhone, and developing and publishing applications for it looks awkward and expensive. If you are unsure of where to start looking for the administrator of your server, a good place to start might be to remember how you found out the host name in the PuTTY configuration. Therefore, to ask us to assume financial liability is to ask us to assume a risk of having to pay it out of our own personal pockets: out of the same budget from which we buy food and clothes and pay our rent. The PuTTY team cannot help you with that. The problem is at the server end. If you have host keys available in the common known_hosts format, we have a script called kh2reg. PuTTY will use them all.

SSH client and server to make it worthwhile. As one of our existing software vendors, can you just fill in this questionnaire for us? The article links to a fix you can download. If you really want financial security, see if you can find a security engineer who will take financial responsibility for the correctness of their review. What terminal type does PuTTY use? Somehow, they have performed calculations that should have given each of them the same key, but have ended up with different keys; so data encrypted by one and decrypted by the other looks like random garbage. The only thing you need to do, to copy text to the clipboard, is to select it. To use PSCP properly, run it from a Command Prompt window.

The general intention was for this porting layer to evolve naturally as part of the process of doing the first port; a Unix port has now been released and the plan seems to be working so far. Would you link to my web site from the PuTTY web site? This is apparently an issue with SP2 that is acknowledged by Microsoft in MS Knowledge Base article 884020. We attempted one around 2005, written as a native Cocoa application, but it turned out to be very slow to redraw its window for some reason we never got to the bottom of. We have generally found this policy to do the Right Thing in almost all situations. Therefore, it would be pretty stupid of us to try it. How do I use PSCP. This is not actually a PuTTY problem. We think that really ought to be enough for anybody. PuTTY you need to use. The existing PuTTY licence document already gives you permission to use or distribute PuTTY in pretty much any way which does not involve pretending you wrote it or suing us if it goes wrong.

Sessions while host keys are stored under SshHostKeys. If you need to know more you should seek professional legal advice. In general, if you want to know if PuTTY supports a particular feature, you should look for it on the PuTTY web site. Will there be a port to Windows CE or PocketPC? To increase the TCP timeout globally, you need to tinker with the Registry. Currently, release versions of PuTTY tools only run on Windows systems and Unix. Normally the control sequence that does this should only be sent deliberately, by programs that know what they are doing and intend to put meaningful text in the window title.

Windows, Mac OS and Unix. PuTTY responds to function key presses by sending a sequence of control characters to the server. If your company policy requires you to have an individual agreement with the supplier of any software you use, then your company policy is simply not well suited to using popular free software, and we urge you to consider this as a flaw in your policy. It will run perfectly well on all processors and on all versions of Windows that PuTTY supports. Again, this is not a question you should be asking us. None of the PuTTY team uses Visual Basic, and none of us has any particular need to make SSH connections from a Visual Basic application. The reason they can afford to do this is because they sell a lot of units, and only a small proportion of them will fail; so they can meet their financial liability out of the income from all the rest of their sales, and still have enough left over to make a profit. See MS Knowledge Base articles 120642 and 314053 for more information. Does PuTTY support local echo?

Documents like that are called contracts of employment, and are generally not signed except in return for a sizeable salary. The PuTTY download page contains more than one version of the software. All sorts of little things. For most things, you need not bother asking us explicitly for permission; our licence already grants you permission. DSA has a major weakness if badly implemented: it relies on a random number generator to far too great an extent. If you can start Plink as a second Windows process, and arrange for your primary process to be able to send data to the Plink process, and receive data from it, through pipes, then you should be able to make SSH connections from your program.

The PuTTY web site is held in high esteem by Google, for precisely this reason: lots of people have linked to it simply because they like PuTTY, without us ever having to ask anyone to link to us. How do I copy and paste between PuTTY and other Windows applications? When I cat a binary file, my window title changes to a nonsense string. PuTTY does not process the commands you type into it. How come PuTTY now supports DSA, when the website used to say how insecure it was? PuTTY also requires a random number seed file, to improve the unpredictability of randomly chosen data needed as part of the SSH cryptography. It might be watching your keystrokes, or it might tamper with the PuTTY binary you download. This will cause Windows to try harder to keep connections alive instead of abandoning them. DSA implementation is probably OK. Touch called pTerm, which is apparently based on PuTTY. PSFTP transfers files much slower than PSCP.

PuTTY is completely free software, and not shareware. These delays are inconvenient, but they are there for your protection. If you look at the source release, you should find a unix subdirectory. Unix ports of most of the traditional PuTTY tools, and also one entirely new application. PuTTYgen can convert both OpenSSH and ssh. See chapter 8 in the documentation for a full discussion of public key authentication. Does PuTTY support reading OpenSSH or ssh. GTK programming experts are keen to have a finished version of this, we urge them to help out with some of the remaining problems! We are generally unwilling to set a precedent that involves us having to enter into individual agreements with PuTTY users.

Is the SSH or Telnet code available as a Visual Basic component? The simplest way to investigate this is to find some other terminal environment, in which that function key does work; and then investigate what sequence the function key is sending in that situation. You can also do this in PuTTY, to find out what sequence the function key is producing in that. But we are a team of free software developers, and that means your relationship with us is nothing like that at all. How can I make PuTTY start up maximised? But we can assure you that there would be nothing preventing anyone from continuing free development if we stopped.

Is there a port to Unix? Therefore, the precise range of commands you can use will not depend on PuTTY, but on what kind of computer you have connected to and what software is running on it.