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This option is available from the command line as '-hostkey', and is also configurable through the GUI. When enabled, it completely replaces all of the automated host key management: the server's host key will be checked against the manually configured list, and the connection will be allowed or disconnected on that basis, and the host key store in the registry will not be either consulted or updated. The main aim is to provide a means of automatically running Plink, PSCP or PSFTP deep inside Windows services where HKEY_CURRENT_USER isn't available to have stored the right host key in. But it also permits you to specify a list of multiple host keys, which means a second use case for the same mechanism will probably be round-robin DNS names that select one of several servers with different host keys. Host keys can be specified as the standard MD5 fingerprint or as an SSH-2 base64 blob, and are canonicalised on input. (The base64 blob is more unwieldy, especially with Windows command-line length limits, but provides a means of specifying the _whole_ public key in case you don't trust MD5. I haven't bothered to provide an analogous mechanism for SSH-1, on the basis that anyone worrying about MD5 should have stopped using SSH-1 already!) [originally from svn r10220]
PuTTY README
============
This is the README file for the PuTTY installer distribution. If
you're reading this, you've probably just run our installer and
installed PuTTY on your system.
What should I do next?
----------------------
If you want to use PuTTY to connect to other computers, or use PSFTP
to transfer files, you should just be able to run them from the
Start menu.
If you want to use the command-line-only file transfer utility PSCP,
you will probably want to put the PuTTY installation directory on
your PATH. How you do this depends on your version of Windows. On
Windows NT, 2000, and XP, you can set it using Control Panel > System;
on Windows 95, 98, and Me, you will need to edit AUTOEXEC.BAT. Consult
your Windows manuals for details.
Some versions of Windows will refuse to run HTML Help files (.CHM)
if they are installed on a network drive. If you have installed
PuTTY on a network drive, you might want to check that the help file
works properly. If not, see http://support.microsoft.com/kb/896054
for information on how to solve this problem.
What do I do if it doesn't work?
--------------------------------
The PuTTY home web site is
http://www.chiark.greenend.org.uk/~sgtatham/putty/
Here you will find our list of known bugs and pending feature
requests. If your problem is not listed in there, or in the FAQ, or
in the manuals, read the Feedback page to find out how to report
bugs to us. PLEASE read the Feedback page carefully: it is there to
save you time as well as us. Do not send us one-line bug reports
telling us `it doesn't work'.