In order to lauch createuser you don't need to modify listen_address since you can use unix sockets. But anyway it's a requirement if you are goint to access remotely.
 Add this line in first place to your pg_hba.conf
 local   all         postgres                          ident sameuser
 Reload postgresql and launch createuser as postgres user.
 -----Original Message-----
From: Major Services <
services.major@gmail.com>
To: 
pgsql-admin@postgresql.orgSubject: [ADMIN] password authentication failed for user postgres
Date: Tue, 2 Mar 2010 14:13:10 +0530
Hi,
1. I have added  listen_addresses = '*' ; in  postgresql.conf
2. And have made the following changes to pg_hba.conf
local   DATABASE    USER   METHOD
local    samegroup      all      password
host    DATABASE    USER    CIDR-ADDRESS  METHOD  [OPTION]
host          all                 all       0.0.0.0/0             md5
hostssl      all                 all       0.0.0.0/0            md5
3. Have restarted the server
4. I can login to the server as user postgres.
But  while trying to createuser I get the following message  :
'createuser: could not connect to database postgres:  FATAL :
password authentication failed for user "postgres"
This is on Redhat running Plesk also.
I am new to Linux as well as PostgreSQL. Help would be much appreciated.
Thanks
Viv