[imp] IMP - IMAP authentication problem

[Diego Peinador]

Hi,
I have a funny problem with the IMAP authentication in IMP4. It always says
'Login failed.' when i try to login. I dont get any errors when i use
thunderbird to check my mail, i can even use the imap server for horde
administration authentication but not for the mail (IMP) authentication
Some of my configurations settings:

servers.php:
$servers['imap'] = array(
    'name' => 'IMAP Server',
    'server' => 'localhost',
    'hordeauth' => false,
    'protocol' => '/imap/ssl/novalidate-cert',
    'port' => 993,
    'folders' => '',
    'namespace' => '',
    'maildomain' => 'mydomain.com',
    'smtphost' => 'localhost',
    'smtpport' => 25,
    'realm' => '',
    'preferred' => '',
    'dotfiles' => false,
    'hierarchies' => array()
);

horde/conf.php: (this works)
$conf['auth']['admins'] = array('me at mydomain.com');
$conf['auth']['checkip'] = true;
$conf['auth']['params']['dsn'] = '{localhost:993/imap/ssl/novalidate-cert}';
$conf['auth']['params']['imapconfig'] = 'dsn';
$conf['auth']['driver'] = 'imap';


Log from /var/log/horde/horde3.log:
Sep 20 23:06:03 HORDE [error] [imp] FAILED LOGIN a.b.c.d to
localhost:993[/imap/ssl/novalidate-cert] as me at mydomain.com [on line 247 of
"/usr/share/horde3/imp/lib/Auth/imp.php"]

Any help will be wellcome,

Thanks in advance