[imp] Horde WebMail 1.1.1 login problem

[kengheng]

Dear All, I've installed Horde Webmail on
1) OpenSuse 11
2) Php 5.2.6
3) Apache 2.0.63
4) courier-imap-4.4.1
5) Qmail/Vpopmail

The qmail/vpopmail working fine together with the courier-imap (I can 
access using thunder bird for smtp, pop and imap), however when try to 
access through horde webmail, the /tmp/horde shown:

Jul 29 18:52:15 HORDE [notice] [imp] Login success for abc at domain.com 
[2xx.1xx.1xx.1xx] to {localhost:143 [imap/notls]} [pid 5513 on line 306 
of "/usr/local/horde/imp/lib/Session.php"]

mail.info shown":

Jul 29 18:52:15 web03 imapd: LOGIN, user=abc at domain.com, 
ip=[::ffff:127.0.0.1], port=[7218], protocol=IMAP
Jul 29 18:52:15 web03 imapd: LOGIN, user=abc at domain.com, 
ip=[::ffff:127.0.0.1], port=[7219], protocol=IMAP
Jul 29 18:52:15 web03 imapd: LOGOUT, user=abc at domain.com, 
ip=[::ffff:127.0.0.1], headers=0, body=0, rcvd=96, sent=541, time=0
Jul 29 18:52:15 web03 imapd: LOGOUT, user=abc at domain.com, 
ip=[::ffff:127.0.0.1], headers=0, body=0, rcvd=252, sent=5731, time=0

However the webmail just return to the imp login screen without any 
message. Any clue ?

Thanks.