[Owncloud] Setting up owncloud with PostgreSQL

[Saint Germain]

Hello,

Using Debian Squeeze with owncloud 4.0.3, I am unable to set it up with
PostgreSQL 9.1.
Whatever the user/password/dbname I put on the set up page, I got this
error message:
can not connect to database, using pgsql. (SQLSTATE[08006] [7]
fe_sendauth: no password supplied)

I have created a user owncloud and a owncloud database and I have
manually confirmed with psql that I can connect to it.

I don't understand what is the problem (permission ?) and I don't have
any other error logs except the above message.

I would really appreciate if someone can give me a hint on how to debug
this ?
Even a more meaningful error message could help.

Thanks,