Problem:
After an Upgrade you just see an empty portal and umc page.
Investigation:
Check for modifyed templates
univention-check-templates
Check your apache logfiles and increase the debug level:
ucr set apache2/loglevel='trace8'
apache2ctl -k graceful
Check your apache configuration files.
Rerun the following joinscripts:
univention-run-join-scripts --force --run-scripts 91univention-saml.inst
univention-run-join-scripts --force --run-scripts 92univention-management-console-web-server.inst
Solution:
The ucr Variable ucs/server/sso/virtualhost was set to false. Therefor the apache univention-saml.conf was not build successfully and the virtual part was missing in the configuration file.
ucr set ucs/server/sso/virtualhost=true
ucr commit /etc/apache2/*
apache2ctl -k graceful