Hello Thomas,
Implementation of asset synchronization with Casper9 is a bit different than sync with previous Casper (pre 9) versions. Instead of pulling assets from Casper's database the synchronization with Casper9 uses JSS API so the Database Name field is not needed.
You need also specify username and password of the JSS server account that will be used to access Asset information via JSS API instead of database account credentials.
I hope this will help you to configure synchronization with your Casper9 server.
We're looking forward to receive your feedback.
Thanks,
Peter