nginx - php5-fpm - php5 - mariadb - session problem (no replies)

Installed nginx, because is needs less ram and cpu as apache.
PHP seems to work (phpinfo)
After setting up php-fusion it's not possible to stay logged in.
When clicking something I'm getting logged out.

The config files looks correnct, the cache directory is also available and accessable
I'll check with other PHP applications but I think the behaviour will be the same

(configs will follow later)

any hints?


Edit

phpmyadmin and wordpress is working fine, so it's a problem with php-fusion or it's configuration.