problems in connecting to a server

Hi

I have two Debian systems, both with

psql (PostgreSQL) 7.4.2
pgadmin3 1.0.2

but in one of them (the laptop) I am unable to make a connection with 
pgadmin3, I always get:

----------
2004-05-11 10:13:12 ERROR  : Error connecting to the server: FATAL:  IDENT 
authentication failed for user "pedro"
----------

The "pedro" user has been created previously with the "createuser"  command

----------
pedro@pcporta16:~$ psql template1
Welcome to psql 7.4.2, the PostgreSQL interactive terminal.

Type:  \copyright for distribution terms      \h for help with SQL commands      \? for help on internal slash commands
    \g or terminate with semicolon to execute query      \q to quit
 

template1=> \du             List of database usersUser name | User ID |         Attributes
-----------+---------+----------------------------fpam      |     101 | create databasepedro     |     100 | create
databasepostgres |       1 | superuser, create database
 
(3 rows)
-----------

Any help will be appreciated, thank you.

-- 
Pedro Henrique e Figueiredo Quaresma de Almeida