I have not tried connecting to SQL 2017 but will attempt to help.
What are your connection parameters? They should look like the below sample:
Driver: com.microsoft.sqlserver.jdbc.SQLServerDriver
URL: jdbc:sqlserver://localhost:1433;DatabaseName=<your_database_name>;SelectMethod=cursor
User name: sa
Also, using MS-SMS, create a systems admin account (sa) and use it to connect Servoy to the SQL server. The other items you mentioned, most likely, use a Windows account to connect.