I've installed nginx recently.
Horde don't list any error, only returns to login page.
When I change options in login page returns to defaults.
I'm using Plesk 12.5.30 #43, courier-imap4.16.1, httpd2.2.3, nginx1.11.1, php5.6.24, psa-horde5.2.6, postfix2.11.5, SO Red Hat Enterprise Linux Server...