If you make any changes to the configuration files (most notably
pg_hba.conf), you need to signal the database server to reload. If your database server is on a Windows computer, this is likely in the start menu:
Start > PostgreSQL 9.0 > Reload Configuration
or if it is on a POSIX system (Linux, Mac OS X, etc.), the direct way is with pg_ctl reload [-s] [-D datadir], or some other convenient service wrapper, e.g. if you install via YUM from http://www.pgrpms.org/:
service postgresql-9.0 reload
The result from either Windows or POSIX reload should show a helpful message, like:
If there are problems with your
pg_hba.conf file, they should appear here.