I installed kolab-horde using these docs:
http://wiki.kolab.org/index.php/Gentoo_-_SysAdmin_-_Installationhttp://wiki.kolab.org/index.php/Gentoo_Extension_-_Hordehttp://wiki.kolab.org/index.php/Kolab2_Installation_-_Horde'
http://wiki.kolab.org/index.php/Kolab2_Server_Troubleshooting_-_Horde#1 - emerge kolabd with horde use variable and install it as per the official gentoo kolab howto
#2 - emerge horde-kolab-all and configure it as per the instructions i found on gentoo specific and general documentation listed above
I get returned to the login page when I successfully logged in, with no error. I found some troubleshooting information about that in the Kolab2_Server_Troubleshooting_-_Horde page, which reads:
Problem
On login the screen turns white for a short time but you are being returned to the login screen. There is no error message but the Horde log file states that the user successfully logged into the system.
Solution
There are several possible reasons for this:
* Missing PEAR packages
* Unwriteable temporary directory
* syntax errors in edited config files
* wrong cookie path
Try to check your log files for any errors. Also check the configuration files for any errors you might have introduced when editing them.
*I know I installed a lot of PEAR packages. Almost too many to list. Is there a list of suspects that I can look into.
*I looked in /tmp and found horde.log there (why not in /var/log?). It indicates no problems, and also implies that horde can write to at least one temporary directory
*As per the documentation I linked to above, besides the bootstrap process, all i needed to do was change one directive in horde/conf/config.php ($conf['auth']['admins'] = array('
admin@example.com')

*Finally, I checked php.ini. The value is as follows: ' session.cookie_path = / ' This is the gentoo default, and I've never had an issue with cookies before
Any help is much appreciated.