Horde Webmail Internal Server Error - 500

[A. Geerts]

I am getting an internal server error whenever I try to use Horde webmail on any of my domains.

Plesk 8.2.1
Version psa v8.2.1_build82070918.10 os_CentOS 4.2
OS Linux 2.6.18-028stab060.2-ent

Anyone who has some ideas what is causing this and even some ideas on how to fix it (or at least try)?

Thanks in advance.

 

[Nataliya Zagr]

If you are hosting more than 300 Web sites on the server, Apache may fail to work because of problem with file descriptors limit. Apache by default can handle only 1024 file descriptors. Every Virtual Host requires 2 or 4 (if HTTPS is enabled) log files, so with this scheme only about 300 domains can be hosted without Apache recompilation.
Piped Logs feature allows to host safely on the default Apache web server build up to 900 domains. To enable Piped Logs the following steps have to be done:

1. Log in to the server shell.
2. Issue the command:
# mysql -uadmin -p`cat /etc/psa/.psa.shadow` psa -e "replace into misc (param,val) values ('apache_pipelog', 'true');"
3. Rebuild Apache configuration:
# $PRODUCT_ROOT_D/admin/sbin/websrvmng -v -a
4. Check if the issue still persists