...
Sometimes an unexpected error occurs when you upgrade Kantega SSO Enterprise in major versions (e. g. from version 4.x to 5.x.). Whenever you get an error we recommed you contact our support team for troubleshooting. To get your system up an running again i the mean time meantime follow the process here: in this giude: Reverting Kantega SSO Enterprise to a stable version
Why do I get a “Missing or invalid CSRF protection token detected
The browser submitted a POST request which did not include a valid CSRF protection token” error after upgrade to version K-SSO version 5
...