problem with kolab-syncroton in hosted domain setting

[mistub]

Hi all

Got a problem with kolab-syncroton 2.0.1 from debian wheezy in 
multidomain-setting. I followed

http://docs.kolab.org/en-US/Kolab_Groupware/3.0/html/Administrator_Guide/index.html
Procedure 11.4. Configuring Roundcube

putting the config-Files for the new domain under 
/etc/roundcubemail/$http_host/ and replacing the content of 
/etc/roundcubemail/kolab_auth.inc.php with:

<?php
if (file_exists(RCMAIL_CONFIG_DIR . '/' . $_SERVER["HTTP_HOST"] . '/' . 
basename(__FILE__))) {
         include_once(RCMAIL_CONFIG_DIR . '/' . $_SERVER["HTTP_HOST"] . 
'/' . basename(__FILE__));
     }
?>

There is a symlink under 
/usr/share/kolab-syncroton/lib/plugins/kolab_auth/config.inc.php 
referencing to /etc/roundcubemail/kolab_auth.inc.php. Testing ActiveSync 
with $http_host/Microsoft-Server-ActiveSync isn't working (after filling 
in the credentials the login window reappears without a message). After 
linking config.inc.php directly to 
/etc/roundcubemail/$http_host/kolab_auth.inc.php it works. How do I fix 
this for my other domains?

Thx
Michael
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