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INSTALL: Advise use of non-native SSL for Windows <= XP

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Advise that WinSSL in versions <= XP will not be able to connect to
servers that no longer support the legacy handshakes and algorithms used
by those versions, and to use an alternate backend like OpenSSL instead.

Bug: https://github.com/bagder/curl/issues/253
Reported-by: zenden2k <zenden2k@gmail.com>
This commit is contained in:
Jay Satiro 2015-06-20 18:45:25 -04:00
parent ea1eec8ea8
commit 6842afbf44
3 changed files with 29 additions and 2 deletions
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13
winbuild/BUILD.WINDOWS.txt
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@ -1,5 +1,5 @@
Building with Visual C++, prerequises
=====================================
Building with Visual C++, prerequisites
=======================================
This document describes how to compile, build and install curl and libcurl
from sources using the Visual C++ build tool. To build with VC++, you will
@ -87,3 +87,12 @@ therefore rarely tested. When passing RTLIBCFG for a configuration that was
already built but not with that option, or if the option was specified
differently, you must destroy the build directory containing the configuration
so that nmake can build it from scratch.
Legacy Windows and SSL
======================
When you build curl using the build files in this directory the default SSL
backend will be WinSSL (Windows SSPI, more specifically Schannel), the native
SSL library that comes with the Windows OS. WinSSL in Windows <= XP is not able
to connect to servers that no longer support the legacy handshakes and
algorithms used by those versions. If you will be using curl in one of those
earlier versions of Windows you should choose another SSL backend like OpenSSL.