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These programs don't work against 9.0 or earlier servers, so check that when the connection is made. That's better than a cryptic error message you got before. Also, these programs won't work with a 9.3 server, because the WAL streaming protocol was changed in a non-backwards-compatible way. As a general rule, we don't make any guarantee that an old client will work with a new server, so check that. However, allow a 9.1 client to connect to a 9.2 server, to avoid breaking environments that currently work; a 9.1 client happens to work with a 9.2 server, even though we didn't make any great effort to ensure that. This patch is for the 9.1 and 9.2 branches, I'll commit a similar patch to master later. Although this isn't a critical bug fix, it seems safe enough to back-patch. The error message you got when connecting to a 9.3devel server without this patch was cryptic enough to warrant backpatching.
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: http://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. Changes between all PostgreSQL releases are recorded in the file HISTORY. 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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.