[horde] Problem using subdomain

[Matthias Reimann]

Hello,

the location of my horde installation is [webroot]/horde/. Horde works
fine if i call mydomain.com/horde/. But I've also set up a subdomain
horde.mydomain.com which points to [webroot]/horde/. If I call
horde.mydomain.com the login screen appears but I'm not able to log in
-- the login screen comes up again and again without showing a login
error message (ne yellow box at the top).

The php server error log contains a few of the following blocks of
messages (only the application is different from log to log):

[05-Sep-2006 11:15:54] PHP Warning:
importconfig(/www/htdocs/xxxxxxx/horde/config/../passwd/config/conf.php)
[<a href='function.importconfig'>function.importconfig</a>]: failed to
open stream: No such file or directory in
/www/htdocs/xxxxxxx/horde/lib/Horde/Registry.php on line 904
[05-Sep-2006 11:15:54] PHP Warning:
importconfig(/www/htdocs/xxxxxxx/horde/config/../passwd/config/conf.php)
[<a href='function.importconfig'>function.importconfig</a>]: failed to
open stream: No such file or directory in
/www/htdocs/xxxxxxx/horde/lib/Horde/Registry.php on line 904
[05-Sep-2006 11:15:54] PHP Warning:  importconfig() [<a
href='function.include'>function.include</a>]: Failed opening
'/www/htdocs/xxxxxxx/horde/config/../passwd/config/conf.php' for
inclusion
(include_path='/www/htdocs/xxxxxxx/horde/lib:.:/usr/share/php:..') in
/www/htdocs/xxxxxxx/horde/lib/Horde/Registry.php on line 904


I just got that the error appears for applications which are not
installed. Besides the paths to the config files are correct.

Thanks for hints,
Matthias Reimann