phpPgAdmin problem

hello

I have a problem with phpPgAdmin_2-4-2

my config file looks like this:

$cfgServers[1]['local'] = true;
$cfgServers[1]['host'] = 'localhost';
$cfgServers[1]['port'] = '5432';
$cfgServers[1]['adv_auth'] = true;

$cfgServers[1]['user'] = ''; // if you are not using adv_auth, e
nter the username to connect all the time
$cfgServers[1]['password'] = ''; // if you are not using adv_auth
and a password is required enter a password
$cfgServers[1]['only_db'] = ''; // if set to a db-name, only this
db is accessible

they say that I should not enter a username if I use adv_auth
but I can not connect. even when I enter a username and a password
nothing happens

what I am doing wrong ??
I have
postgresql-7.2.1
php 4.2.1
RedHat 7.3
phpPgAdmin_2-4-2

markus