problem with postgis

[Juan Baron]

Hello list,

I am using mapserver 4.4.1 and postgresql 8.0 with postgis.

I have a layer in the map file:

LAYER
  CONNECTIONTYPE postgis
    NAME callejero
    CONNECTION "user=postgres dbname=pruebapostgis host=localhost
port=5432"
    DATA "the_geom from tablacallejero"
    STATUS DEFAULT
    TYPE LINE
    CLASS
     COLOR 255 0 0
    END
END

and when I execute the application, the layer doesn't appear me  and the
result is a message for screen:

msDrawMap(): Image handling error. Failed to draw layer named 'callejero'.
msPOSTGISLayerOpen(): Query error. couldnt make connection to DB with
connect string 'user=postgres dbname=pruebapostgis host=localhost
port=5432'.
Error reported was 'could not translate host name "localhost" to address:
Unknown host '.
This error occured when trying to make a connection to the specified
postgresql server.
Most commonly this is caused by
(1) incorrect connection string
(2) you didnt specify a 'user=...' in your connection string
(3) the postmaster (postgresql server) isnt running
(4) you are not allowing TCP/IP connection to the postmaster
(5) your postmaster is not running on the correct port - if its not on
5432 you must specify a 'port=...'
(6) the security on your system does not allow the webserver (usually
user 'nobody') to make socket connections to the postmaster
(7) you forgot to specify a 'host=...' if the postmaster is on a different
machine
(8) you made a typo

I have proven to change localhost for 127.0.0.1, but the result is the
same one.

postgresql this being executed, because if I put netstat - na appears:

TCP 127.0.0.1:5432  LISTENING

I don't know which is the problem.

Thank's