[horde] horde not auth with dovecot

[Andreas Mauser]

Hi,

we created another Horde server, CentOS, postfix, dovecot, we can  
connect with thunderbird, and send mails to local users. The Horde 5  
installation went fine, we could configure everything well, but when  
it comes to switch to Horde IMAP authentification Horde says always we  
can not log on because of password or username wrong.

This will be a test server before updates goes production, and we use  
'' in cookies with no FQDN.
We set Horde to Debug but the only message that comes up in syslog is:

Jun 16 16:44:28 testhorde HORDE: [horde] FAILED LOGIN for andreas
[192.168.24.110] to Horde [pid 1601 on line 199 of
"/var/www/html/webmail/login.php"]

We did not change the imp/config/backends.php:

// IMAP server
$servers['imap'] = array(
     // ENABLED by default; will connect to IMAP port on local server
     'disabled' => false,
     'name' => 'IMAP Server',
     'hostspec' => 'localhost',
     'hordeauth' => false,
     'protocol' => 'imap',
     'port' => 143,
     // Plaintext logins are disabled by default on IMAP servers (see RFC 3501
     // [6.2.3]), so TLS is the only guaranteed authentication available by
     // default.
     'secure' => 'tls',
);

I just found a link to an older thread where it says to try  
backends.local.php with:

<?php
$servers['imap']['secure'] = false;

Which did not lead to success.

How can we get out more information of Horde, or maybe you know this poblem?

Thank you,
Andreas
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