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Tom Lane b63dd3d88f Add hints about protocol-version-related SSL connection failures. 
OpenSSL's native reports about problems related to protocol version
restrictions are pretty opaque and inconsistent.  When we get an
SSL error that is plausibly due to this, emit a hint message that
includes the range of SSL protocol versions we (think we) are
allowing.  This should at least get the user thinking in the right
direction to resolve the problem, even if the hint isn't totally
accurate, which it might not be for assorted reasons.

Back-patch to v13 where we increased the default minimum protocol
version, thereby increasing the risk of this class of failure.

Patch by me, reviewed by Daniel Gustafsson

Discussion: https://postgr.es/m/a9408304-4381-a5af-d259-e55d349ae4ce@2ndquadrant.com
 		2020-06-27 12:47:58 -04:00
config Update config.guess and config.sub 2020-04-30 09:06:49 +02:00
contrib Replace superuser check by ACLs for replication origin functions 2020-06-14 12:40:37 +09:00
doc Change libpq's default ssl_min_protocol_version to TLSv1.2. 2020-06-27 12:20:33 -04:00
src Add hints about protocol-version-related SSL connection failures. 2020-06-27 12:47:58 -04:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
.editorconfig Add .editorconfig 2019-12-18 09:13:13 +01:00
.gitattributes gitattributes: Add new file 2019-11-12 08:13:55 +01:00
.gitignore Support for optimizing and emitting code in LLVM JIT provider. 2018-03-22 11:05:22 -07:00
COPYRIGHT Update copyrights for 2020 2020-01-01 12:21:45 -05:00
GNUmakefile.in Make install-tests target work with vpath builds 2020-05-31 18:33:00 -04:00
HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Don't unset MAKEFLAGS in non-GNU Makefile. 2019-06-25 09:36:21 +12:00
README Canonicalize some URLs 2020-02-10 20:47:50 +01:00
README.git Canonicalize some URLs 2020-02-10 20:47:50 +01:00
aclocal.m4 Fix configure's AC_CHECK_DECLS tests to work correctly with clang. 2018-11-19 12:01:47 -05:00
configure Stamp HEAD as 14devel. 2020-06-07 17:16:30 -04:00
configure.in Stamp HEAD as 14devel. 2020-06-07 17:16:30 -04:00

README 

PostgreSQL Database Management System
=====================================

This directory contains the source code distribution of the PostgreSQL
database management system.

PostgreSQL is an advanced object-relational database management system
that supports an extended subset of the SQL standard, including
transactions, foreign keys, subqueries, triggers, user-defined types
and functions.  This distribution also contains C language bindings.

PostgreSQL has many language interfaces, many of which are listed here:

	https://www.postgresql.org/download/

See the file INSTALL for instructions on how to build and install
PostgreSQL.  That file also lists supported operating systems and
hardware platforms and contains information regarding any other
software packages that are required to build or run the PostgreSQL
system.  Copyright and license information can be found in the
file COPYRIGHT.  A comprehensive documentation set is included in this
distribution; it can be read as described in the installation
instructions.

The latest version of this software may be obtained at
https://www.postgresql.org/download/.  For more information look at our
web site located at https://www.postgresql.org/.