Topic "Connection to SQL Server" a message from Flotto

Hello

I have an AD Service User DOMAIN\rdm.service and also created a login at our SQL Server and gave sysadmin permission to create a new RDM DB. If a start the Remote Desktop Manager with this user and use integrated security, then I can contact the DB Server. But if I type in exactly these user credentials I get a warning, that RDM is unable to connect to the SQL Server. Any hint for this?

Thanks in advance