Hello Patrick,
thanks a lot for your answer.
The sso module in i-doit was already disabled, but I additionally disabled the kerb mod for apache. Now I got a php fatal error:
[Tue Oct 15 11:21:35.258244 2019] [php7:error] [pid 26725] [client 192.168.66.61:54465] PHP Fatal error: Uncaught Error: Call to undefined method Symfony\Component\DependencyInjection\ContainerBuilder::hash() in /var/www/html/idoit/vendor/symfony/dependency-injection/Loader/YamlFileLoader.php:145\nStack trace:\n
#0 /var/www/html/idoit/src/classes/core/isys_application.class.php(194): Symfony\Component\DependencyInjection\Loader\YamlFileLoader->load('/var/www/html/i...')\n#1 /var/www/html/idoit/src/bootstrap.inc.php(71): isys_application->bootstrap()\n#2 /var/www/html/idoit/index.php(101): include_once('/var/www/html/i...')\n
#3 {main}\n thrown in /var/www/html/idoit/vendor/symfony/dependency-injection/Loader/YamlFileLoader.php on line 145, referer: https://idoit.xxx.xxx.xxx/?load=update
😕
Greetings,
-Manuel