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This is a guide to providing feedback to the PuTTY development team. It is provided as both a web page on the PuTTY site, and an appendix in the PuTTY manual.
Section B.1 gives some general guidelines for sending any kind of e-mail to the development team. Following sections give more specific guidelines for particular types of e-mail, such as bug reports and feature requests.
The PuTTY development team gets a lot of mail. If you can possibly solve your own problem by reading the manual, reading the FAQ, reading the web site, asking a fellow user, or some other means, then it would make our lives much easier.
We get so much e-mail that we literally do not have time to answer it all. We regret this, but there's nothing we can do about it. So if you can possibly avoid sending mail to the PuTTY team, we recommend you do so. In particular, support requests (section B.7) are probably better sent to some public forum, or passed to a local expert if possible.
The PuTTY contact email address is a private mailing list containing four or five core developers. Don't be put off by it being a mailing list: if you need to send confidential data as part of a bug report, you can trust the people on the list to respect that confidence. Also, the archives aren't publicly available, so you shouldn't be letting yourself in for any spam by sending us mail.
Please use a meaningful subject line on your message. We get a lot of mail, and it's hard to find the message we're looking for if they all have subject lines like ‘PuTTY bug’.
Since the PuTTY contact address is a mailing list, e-mails larger than 40Kb will be held for inspection by the list administrator, and will not be allowed through unless they really appear to be worth their large size.
If you are considering sending any kind of large data file to the PuTTY team, it's almost always a bad idea, or at the very least it would be better to ask us first whether we actually need the file. Alternatively, you could put the file on a web site and just send us the URL; that way, we don't have to download it unless we decide we actually need it, and only one of us needs to download it instead of it being automatically copied to all the developers.
(If the file contains confidential information, then you could encrypt it with our Secure Contact Key; see section F.1 for details. Please only use this for information that needs to be confidential.)
Some people like to send mail in MS Word format. Please don't send us bug reports, or any other mail, as a Word document. Word documents are roughly fifty times larger than writing the same report in plain text. In addition, most of the PuTTY team read their e-mail on Unix machines, so copying the file to a Windows box to run Word is very inconvenient. Not only that, but several of us don't even have a copy of Word!
Some people like to send us screen shots when demonstrating a problem. Please don't do this without checking with us first - we almost never actually need the information in the screen shot. Sending a screen shot of an error box is almost certainly unnecessary when you could just tell us in plain text what the error was. (On some versions of Windows, pressing Ctrl-C when the error box is displayed will copy the text of the message to the clipboard.) Sending a full-screen shot is occasionally useful, but it's probably still wise to check whether we need it before sending it.
If you must mail a screen shot, don't send it as a .BMP file. BMPs have no compression and they are much larger than other image formats such as PNG, TIFF and GIF. Convert the file to a properly compressed image format before sending it.
Please don't mail us executables, at all. Our mail server blocks all incoming e-mail containing executables, as a defence against the vast numbers of e-mail viruses we receive every day. If you mail us an executable, it will just bounce.
If you have made a tiny modification to the PuTTY code, please send us a patch to the source code if possible, rather than sending us a huge .ZIP file containing the complete sources plus your modification. If you've only changed 10 lines, we'd prefer to receive a mail that's 30 lines long than one containing multiple megabytes of data we already have.
If you think you have found a bug in PuTTY, your first steps should be:
If none of those options solved your problem, and you still need to report a bug to us, it is useful if you include some general information:
https://www.chiark.greenend.org.uk/~sgtatham/bugs.html is an article on how to report bugs effectively in general. If your bug report is particularly unclear, we may ask you to go away, read this article, and then report the bug again.
It is reasonable to report bugs in PuTTY's documentation, if you think the documentation is unclear or unhelpful. But we do need to be given exact details of what you think the documentation has failed to tell you, or how you think it could be made clearer. If your problem is simply that you don't understand the documentation, we suggest asking around and seeing if someone will explain what you need to know. Then, if you think the documentation could usefully have told you that, send us a bug report and explain how you think we should change it.
If you've found a security vulnerability in PuTTY, you might well want to notify us using an encrypted communications channel, to avoid disclosing information about the vulnerability before a fixed release is available.
For this purpose, we provide a GPG key suitable for encryption: the Secure Contact Key. See section F.1 for details of this.
(Of course, vulnerabilities are also bugs, so please do include as much information as possible about them, the same way you would with any other bug report.)
If you want to request a new feature in PuTTY, the very first things you should do are:
If you can't find your feature in either the development snapshots or the Wishlist, then you probably do need to submit a feature request. Since the PuTTY authors are very busy, it helps if you try to do some of the work for us:
If a feature is already listed on the Wishlist, then it usually means we would like to add it to PuTTY at some point. However, this may not be in the near future. If there's a feature on the Wishlist which you would like to see in the near future, there are several things you can do to try to increase its priority level:
It's normal for SSH implementations to automatically enable workarounds for each other's bugs, using the software version strings that are exchanged at the start of the connection. Typically an SSH client will have a list of server version strings that it believes to have particular bugs, and auto-enable the appropriate set of workarounds when it sees one of those strings. (And servers will have a similar list of workarounds for client software they believe to be buggy.)
If you've found a bug in an SSH server, and you'd like us to add an auto-detected workaround for it, our policy is that the server implementor should fix it first.
If the server implementor has fixed it in the latest version, and can give us a complete description of the version strings that go with the bug, then we're happy to use those version strings as a trigger to automatically enable our workaround (assuming one is possible). We won't accept requests to auto-enable workarounds for an open-ended set of version strings, such as ‘any version of FooServer, including future ones not yet released’.
The aim of this policy is to encourage implementors to gradually converge on the actual standardised SSH protocol. If we enable people to continue violating the spec, by installing open-ended workarounds in PuTTY for bugs they're never going to fix, then we're contributing to an ecosystem in which everyone carries on having bugs and everyone else carries on having to work around them.
An exception: if an SSH server is no longer maintained at all (e.g. the company that produced it has gone out of business), and every version of it that was ever released has a bug, then that's one situation in which we may be prepared to add a workaround rule that matches all versions of that software. (The aim is to stop implementors from continuing to release software with the bug – and if they're not releasing it at all any more, then that's already done!)
We do recognise that sometimes it will be difficult to get the server maintainer to fix a bug, or even to answer support requests at all. Or it might take them a very long time to get round to doing anything about it. We're not completely unwilling to compromise: we're prepared to add manually enabled workarounds to PuTTY even for bugs that an implementation hasn't fixed yet. We just won't automatically enable the workaround unless the server maintainer has also done their part.
If you're trying to make PuTTY do something for you and it isn't working, but you're not sure whether it's a bug or not, then please consider looking for help somewhere else. This is one of the most common types of mail the PuTTY team receives, and we simply don't have time to answer all the questions. Questions of this type include:
If you absolutely cannot get a support question answered any other way, you can try mailing it to us, but we can't guarantee to have time to answer it.
If the PuTTY web site is down (Connection Timed Out), please don't bother mailing us to tell us about it. Most of us read our e-mail on the same machines that host the web site, so if those machines are down then we will notice before we read our e-mail. So there's no point telling us our servers are down.
Of course, if the web site has some other error (Connection Refused, 404 Not Found, 403 Forbidden, or something else) then we might not have noticed and it might still be worth telling us about it.
If you want to report a problem with our web site, check that you're looking at our real web site and not a mirror. The real web site is at https://www.chiark.greenend.org.uk/~sgtatham/putty/; if that's not where you're reading this, then don't report the problem to us until you've checked that it's really a problem with the main site. If it's only a problem with the mirror, you should try to contact the administrator of that mirror site first, and only contact us if that doesn't solve the problem (in case we need to remove the mirror from our list).
PuTTY is distributed under the MIT Licence (see appendix D for details). This means you can do almost anything you like with our software, our source code, and our documentation. The only things you aren't allowed to do are to remove our copyright notices or the licence text itself, or to hold us legally responsible if something goes wrong.
So if you want permission to include PuTTY on a magazine cover disk, or as part of a collection of useful software on a CD or a web site, then permission is already granted. You don't have to mail us and ask. Just go ahead and do it. We don't mind.
(If you want to distribute PuTTY alongside your own application for use with that application, or if you want to distribute PuTTY within your own organisation, then we recommend, but do not insist, that you offer your own first-line technical support, to answer questions about the interaction of PuTTY with your environment. If your users mail us directly, we won't be able to tell them anything useful about your specific setup.)
If you want to use parts of the PuTTY source code in another program, then it might be worth mailing us to talk about technical details, but if all you want is to ask permission then you don't need to bother. You already have permission.
If you just want to link to our web site, just go ahead. (It's not clear that we could stop you doing this, even if we wanted to!)
If you want to set up a mirror of the PuTTY website, go ahead and set one up. Please don't bother asking us for permission before setting up a mirror. You already have permission.
If the mirror is in a country where we don't already have plenty of mirrors, we may be willing to add it to the list on our mirrors page. Read the guidelines on that page, make sure your mirror works, and email us the information listed at the bottom of the page.
Note that we do not promise to list your mirror: we get a lot of mirror notifications and yours may not happen to find its way to the top of the list.
Also note that we link to all our mirror sites using the rel="nofollow" attribute. Running a PuTTY mirror is not intended to be a cheap way to gain search rankings.
If you have technical questions about the process of mirroring, then you might want to mail us before setting up the mirror (see also the guidelines on the Mirrors page); but if you just want to ask for permission, you don't need to. You already have permission.
One of the most rewarding things about maintaining free software is getting e-mails that just say ‘thanks’. We are always happy to receive e-mails of this type.
Regrettably we don't have time to answer them all in person. If you mail us a compliment and don't receive a reply, please don't think we've ignored you. We did receive it and we were happy about it; we just didn't have time to tell you so personally.
To everyone who's ever sent us praise and compliments, in the past and the future: you're welcome!
The actual address to mail is <putty@projects.tartarus.org>.
If you want to provide feedback on this manual or on the PuTTY tools themselves, see the Feedback page.
[PuTTY pre-release 0.83:2024-12-20.98200d1]