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PuTTY can now connect to local serial ports as well as making network
connections.
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Windows PuTTY now supports "local proxying", where a network
connection is replaced by a local command. (Unix PuTTY has supported
this since it was first released in 0.54.) Also, Plink has gained a
"
-nc" mode where the primary channel is replaced by an
SSH tunnel, which makes it particularly useful as the local command
to run.
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Improved speed of SSH on Windows (particularly SSH-2 key exchange and
public-key authentication).
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Improved SFTP throughput.
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Various cryptographic improvements in SSH-2, including SDCTR cipher
modes, a workaround for a weakness in CBC cipher modes, and
Diffie-Hellman group exchange with SHA-256.
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Support for the Arcfour cipher in SSH-2.
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Support for sending terminal modes in SSH.
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When Pageant is running and an SSH key is specified in the
configuration, PuTTY will now only try Pageant authentication with
that key. This gets round a problem where some servers would only
allow a limited number of keys to be offered before disconnecting.
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Support for SSH-2 password expiry mechanisms, and various other
improvements and bugfixes in authentication.
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A change to the SSH-2 password camouflage mechanism in 0.58 upset some
Cisco servers, so we have reverted to the old method.
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The Windows version now comes with documentation in HTML Help
format. (Windows Vista does not support the older WinHelp format.
However, we still provide documentation in that format, since Win95
does not support HTML Help.)
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On Windows, when pasting as RTF, attributes of the selection such as
colours and formatting are also pasted.
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Ability to configure font quality on Windows (including antialiasing
and ClearType).
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The terminal is now restored to a sensible state when reusing a window
to restart a session.
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We now support an escape sequence invented by xterm which lets the
server clear the scrollback (CSI 3 J). This is useful for applications
such as terminal locking programs.
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Improvements to the Unix port:
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now compiles cleanly with GCC 4
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now has a
configure script, and should be portable to
more platforms
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Bug fix: 0.58 utterly failed to run on some installations of
Windows XP.
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Bug fix: PSCP and PSFTP now support large files (greater than 4
gigabytes), provided the underlying operating system does too.
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Bug fix: PSFTP (and PSCP) sometimes ran slowly and consumed lots of
CPU when started directly from Windows Explorer.
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Bug fix: font linking (the automatic use of other fonts on the
system to provide Unicode characters not present in the selected
one) should now work again on Windows, after being broken in 0.58.
(However, it unfortunately still won't work for Arabic and other
right-to-left text.)
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Bug fix: if the remote server saturated PuTTY with data, PuTTY could
become unresponsive.
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Bug fix: certain large clipboard operations could cause PuTTY to
crash.
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Bug fix: SSH-1 connections tended to crash, particularly when using
port forwarding.
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Bug fix: SSH Tectia Server would reject SSH-2 tunnels from PuTTY due
to a malformed request.
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Bug fix: SSH-2 login banner messages were being dropped silently under
some circumstances.
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Bug fix: the cursor could end up in the wrong place when a server-side
application used the alternate screen.
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Bug fix: on Windows, PuTTY now tries harder to find a suitable place
to store its random seed file
PUTTY.RND (previously it
was tending to end up in C:\ or C:\WINDOWS).
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Bug fix: IPv6 should now work on Windows Vista.
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Numerous other bugfixes, as usual.
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PuTTY 0.59 beta 
