[imp] I: Horde and Imp configuration problem

[di gregorio daniele]

I have a proble with the horde installation over Debian

I have installed debian testing/unstable
Horde last version
imp 3.0
Apache 1.3.29
php4.3.3
pear
courier-imap

horde  is in the directory /var/www
imp is in the /var/www/horde

I setted the file horde.php in this way
___________________________________________________________________
$conf['auth']['driver'] = 'imap';
$conf['auth']['params']['dsn'] = '{localhost:143/imap/notls}INBOX';

$conf['prefs']['driver'] = 'sql';
$conf['prefs']['params']['phptype'] = 'mysql';
 $conf['prefs']['params']['hostspec'] = 'localhost';
 $conf['prefs']['params']['username'] = 'horde';
 $conf['prefs']['params']['password'] = 'mypassword';
 $conf['prefs']['params']['database'] = 'horde';
 $conf['prefs']['params']['table'] = 'horde_prefs';
____________________________________________________________________

and the file registry.php in this other way
____________________________________________________________________
 $this->registry['auth']['login'] = 'imp';
 $this->registry['auth']['logout'] = 'imp';

/* mail: Handler for sending mail. */
$this->registry['mail']['compose'] = 'imp';
$this->registry['mail']['composePopup'] = 'imp';

$this->applications['imp'] = array(
    'fileroot' => dirname(__FILE__) . '/../imp',
    'webroot' => $this->applications['horde']['webroot'] . '/imp',
    'icon' => $this->applications['horde']['webroot'] .
'/imp/graphics/imp.gif',
    'name' => _("Mail"),
    'allow_guests' => false,
    'status' => 'active'
______________________________________________________________________

and the file server.php in this way:
______________________________________________________________________
$servers['imap'] = array(
    'name' => 'IMAP Server',
    'server' => 'localhost',
    'protocol' => 'imap',
    'port' => 143,
    'folders' => 'mail/',
    'namespace' => '',
    'maildomain' => 'localhost',
    'smtphost' => 'localhost',
    'realm' => '',
    'preferred' => ''
________________________________________________________________________

The trouble is:
when I put the following link in my Browser
http://debian/horde/
I receive page unavailable
and the Apache's log are
number 200
number 303


Have you got any solution?
Shall I configure Apache in a particular way?
Thanks Daniele