connecting to postgres server from Access

Hi,

I'm running a postgres db server on my linux machine. Someone else would like 
to build his frontends with MS Access and use the postgres server as backend. 
He installed the Pg/ODBC-Driver linked to at the pg web site. But when he 
tries to link in some table he always gets an error message about wrong 
authentication. I inserted his IP address in the pg_hba.conf file and created 
a linux user account for him as well as a pg user account within "template1". 
So he could log in and use "createdb" to create his own db. I tried to set 
his password within pgaccess, but pgaccess claims about wrong input (""). 
Leaving the password field empty doesn't help to get the connection.  Then I 
set his password with "ALTER USER" in pgsql. But there still is no connection 
from access to pg yet.

Could someone help?

Thanks,

Markus