[IMP] login failure

[Raphaël RIGNIER]

here's my config :

linux mandrake 9.0

apache 2.0.45
php 4.3.1 (with openssl imap imap-ssl...)
horde 2.2.3
imp 3.2.1
imap2002c1 (with PAM) SSLTYPE=unix
MySQL 3.23.52


IMP is installed in the SSL web root at https://www/horde/imp

It seems it can't connect to the local imap server using IMP
server : localhost
type : imap/notls
port: 143

However, authentication with same parameters works great with HORDE!

I tried different config :
imap
imap/novalidate-cert
imap/ssl/novalidate-cert with port 993

But always the same error!

the imp/test.php return the following error :

string(61) "Retrying login authentication after AUTHENTICATE
LOGIN failed"
string(61) "Retrying login authentication after AUTHENTICATE
LOGIN failed"
string(62) "Cannot authenticate to IMAP server: AUTHENTICATE
LOGIN failed"

there are no errors in hore.log file

the /var/log/message is
May 27 18:06:57 bouba imapd[17911]: Login failed user=rignier auth=rignier
host=localhost.localdomain [127.0.0.1]
May 27 18:07:00 bouba imapd[17911]: AUTHENTICATE LOGIN failure
host=localhost.localdomain [127.0.0.1]
May 27 18:07:00 bouba imap(pam_unix)[17911]: authentication failure;
logname= uid=0 euid=0 tty= ruser= rhost=127.0.0.1  user=rignier
May 27 18:07:02 bouba imapd[17911]: Login failed user=rignier
auth=rignier
host=localhost.localdomain [127.0.0.1]
May 27 18:07:05 bouba imapd[17911]: AUTHENTICATE LOGIN failure
host=localhost.localdomain [127.0.0.1]
May 27 18:07:05 bouba imap(pam_unix)[17911]: authentication failure;
logname= uid=0 euid=0 tty= ruser= rhost=127.0.0.1  user=rignier
May 27 18:07:08 bouba imapd[17911]: Login failed user=rignier
auth=rignier
host=localhost.localdomain [127.0.0.1]
May 27 18:07:11 bouba imapd[17911]: AUTHENTICATE LOGIN failure
host=localhost.localdomain [127.0.0.1]
May 27 18:07:11 bouba imapd[17911]: Logout user=???
host=localhost.localdomain [127.0.0.1]

Any idea what's wrong?

Thank you.

Raphaël