[horde] Authentication problem

[HaitianZone]

I am having problem to use IMP. I am not sure if the problem comes from Horde or IMP configuration. I authenticate my user via a database. I have no problem logging from Horde. However, each time I click on  "Mail" from the left menu it ask me to enter my username and password again, and after clicking on the submit button it says "Login failed." .
   Could you tell me why it authenticates my user for Horde and not for IMP? Is it because Horde and IMP use different authentication system? If yes, let me know how I should configure the authentication for the IMP.
  Thanks in advance.
  ~Reginald
   
  Below is the config/conf.php files for Horde and IMP:
   
  Hore:
  <?php
/* CONFIG START. DO NOT CHANGE ANYTHING IN OR AFTER THIS LINE. */
// $Horde: horde/config/conf.xml,v 1.74.2.14 2005/08/23 17:14:42 mrubinsk Exp $
$conf['debug_level'] = E_ALL;
$conf['max_exec_time'] = 0;
$conf['use_ssl'] = 2;
$conf['server']['name'] = $_SERVER['SERVER_NAME'];
$conf['server']['port'] = $_SERVER['SERVER_PORT'];
$conf['compress_pages'] = true;
$conf['umask'] = 077;
$conf['session']['name'] = 'Horde';
$conf['session']['cache_limiter'] = 'nocache';
$conf['session']['timeout'] = 0;
$conf['cookie']['domain'] = $_SERVER['SERVER_NAME'];
$conf['cookie']['path'] = '/horde';
$conf['sql']['persistent'] = false;
$conf['sql']['hostspec'] = 'localhost';
$conf['sql']['username'] = 'userdb';
$conf['sql']['password'] = 'pwddb';
$conf['sql']['protocol'] = 'unix';
$conf['sql']['database'] = 'horde';
$conf['sql']['charset'] = 'iso-8859-1';
$conf['sql']['phptype'] = 'mysql';
$conf['auth']['admins'] = array('regi4x4');
$conf['auth']['checkip'] = true;
$conf['auth']['params']['phptype'] = 'mysql';
$conf['auth']['params']['protocol'] = 'unix';
$conf['auth']['params']['hostspec'] = 'localhost';
$conf['auth']['params']['username'] = 'userdb';
$conf['auth']['params']['password'] = 'pwddb';
$conf['auth']['params']['database'] = 'phpbb_forum_haitianzone_com';
$conf['auth']['params']['driverconfig'] = 'custom';
$conf['auth']['params']['table'] = 'phpbb_users';
$conf['auth']['params']['username_field'] = 'username';
$conf['auth']['params']['password_field'] = 'user_password';
$conf['auth']['params']['encryption'] = 'md5-hex';
$conf['auth']['params']['show_encryption'] = false;
$conf['auth']['driver'] = 'sql';
$conf['signup']['allow'] = true;
$conf['signup']['approve'] = false;
$conf['signup']['preprocess'] = false;
$conf['signup']['queue'] = false;
$conf['log']['priority'] = PEAR_LOG_DEBUG;
$conf['log']['ident'] = 'HORDE';
$conf['log']['params'] = array();
$conf['log']['name'] = '/tmp/horde.log';
$conf['log']['params']['append'] = true;
$conf['log']['type'] = 'file';
$conf['log']['enabled'] = true;
$conf['log_accesskeys'] = false;
$conf['prefs']['params']['table'] = 'horde_prefs';
$conf['prefs']['params']['driverconfig'] = 'horde';
$conf['prefs']['driver'] = 'sql';
$conf['datatree']['params']['table'] = 'horde_datatree__seq';
$conf['datatree']['params']['driverconfig'] = 'horde';
$conf['datatree']['driver'] = 'sql';
$conf['group']['driver'] = 'datatree';
$conf['cache']['default_lifetime'] = 1800;
$conf['cache']['params']['dir'] = Horde::getTempDir();
$conf['cache']['driver'] = 'file';
$conf['token']['driver'] = 'none';
$conf['mailer']['params']['sendmail_path'] = '/usr/lib/sendmail';
$conf['mailer']['params']['sendmail_args'] = '-oi';
$conf['mailer']['type'] = 'sendmail';
$conf['vfs']['params']['vfsroot'] = '/tmp';
$conf['vfs']['type'] = 'file';
$conf['sessionhandler']['type'] = 'none';
$conf['problems']['email'] = 'webmaster at example.com';
$conf['menu']['always'] = false;
$conf['menu']['links']['help'] = 'all';
$conf['menu']['links']['options'] = 'authenticated';
$conf['menu']['links']['problem'] = 'all';
$conf['menu']['links']['login'] = 'all';
$conf['menu']['links']['logout'] = 'authenticated';
$conf['hooks']['username'] = false;
$conf['hooks']['preauthenticate'] = false;
$conf['hooks']['postauthenticate'] = false;
$conf['hooks']['authldap'] = false;
$conf['kolab']['enabled'] = false;
$conf['imsp']['enabled'] = false;
/* CONFIG END. DO NOT CHANGE ANYTHING IN OR BEFORE THIS LINE. */

  IMP:
  <?php
/* CONFIG START. DO NOT CHANGE ANYTHING IN OR AFTER THIS LINE. */
// $Horde: imp/config/conf.xml,v 1.53 2004/12/09 15:33:27 slusarz Exp $
$conf['utils']['gnupg_keyserver'] = array('wwwkeys.pgp.net');
$conf['utils']['gnupg_timeout'] = '10';
$conf['utils']['openssl_cafile'] = '/somewhere/ca-bundle.crt';
$conf['utils']['openssl_binary'] = '/usr/bin/openssl';
$conf['menu']['apps'] = array('horde', 'imp');
$conf['user']['allow_folders'] = true;
$conf['user']['allow_view_source'] = true;
$conf['user']['allow_resume_all'] = false;
$conf['user']['allow_resume_all_in_drafts'] = false;
$conf['user']['alternate_login'] = false;
$conf['user']['redirect_on_logout'] = false;
$conf['user']['select_sentmail_folder'] = false;
$conf['server']['server_list'] = 'none';
$conf['server']['change_server'] = false;
$conf['server']['change_port'] = false;
$conf['server']['change_protocol'] = false;
$conf['server']['change_folders'] = false;
$conf['server']['sort_limit'] = '0';
$conf['server']['cache_folders'] = false;
$conf['mailbox']['show_attachments'] = false;
$conf['mailbox']['show_preview'] = false;
$conf['mailbox']['show_xpriority'] = false;
$conf['fetchmail']['show_account_colors'] = false;
$conf['fetchmail']['size_limit'] = '4000000';
$conf['msgsettings']['filtering']['words'] = './config/filter.txt';
$conf['msgsettings']['filtering']['replacement'] = '****';
$conf['spam']['reporting'] = false;
$conf['notspam']['reporting'] = false;
$conf['msg']['prepend_header'] = true;
$conf['msg']['append_trailer'] = true;
$conf['compose']['use_vfs'] = false;
$conf['compose']['allow_cc'] = true;
$conf['compose']['allow_bcc'] = true;
$conf['compose']['allow_receipts'] = true;
$conf['compose']['special_characters'] = true;
$conf['compose']['link_all_attachments'] = false;
$conf['compose']['link_attachments'] = true;
$conf['compose']['add_maildomain_to_unexpandable'] = false;
$conf['compose']['attach_size_limit'] = '0';
$conf['compose']['attach_count_limit'] = '0';
$conf['hooks']['vinfo'] = false;
$conf['hooks']['signature'] = false;
$conf['hooks']['trailer'] = false;
$conf['hooks']['fetchmail_filter'] = false;
$conf['hooks']['mbox_redirect'] = false;
$conf['hooks']['mbox_icon'] = false;
$conf['hooks']['spam_bounce'] = false;
$conf['maillog']['use_maillog'] = true;
$conf['tasklist']['use_tasklist'] = true;
/* CONFIG END. DO NOT CHANGE ANYTHING IN OR BEFORE THIS LINE. */

		
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