Felix,
Based on your question I see a couple items that can be reviewed and if additional assistance is needed, I would strongly advise contacting Support to review your configuration and assist further.
If configuring security is a concern, please refer to the Configuring Security documentation located here: https://techdocs.broadcom.com/us/en/ca-mainframe-software/intelligent-operations/ca-mainframe-operational-intelligence/2-1/administrating/configure-security.html
For accessing and administrating the Controller, please consult the documentation located here: https://techdocs.broadcom.com/us/en/ca-mainframe-software/intelligent-operations/ca-mainframe-operational-intelligence/2-1/administrating/log-in-to-the-appliance-controller.html