Problems connecting (from php to pg)

Hello all,

I've the "standard connection error":

Unable to connect to PostgreSQL server: could not connect to server:
Permission denied.
Is the server running on host "localhost" and accepting TCP/IP
connections on port 5432?

The system is, yes, running and -I think- accepting TCP/IP connections
(I've tested this with netstat, I can connect to it with psql -h
localhost, and so).

In the server where I am testing this I have FC7 installed, so the php
and the pgsql-php packages are:

PHP Version 5.2.6
PostgreSQL(libpq) Version     8.2.7

I think that there is a problem in the pgsql-php module. I've created
a ssh tunnel, and trying the connection to the same database from
other server (with PHP Version 5.2.5-3 and pgsql that supports
postgresql 8.3.0).

The postgresql version in the server is the 8.3.0.

What can we do? I am doing these tests with a simple php code (just a
pg_connect()).

Thanks in advance,
  Carlos.