Cannot setup MSSQL-Database / EOF

Hi,

I use grafana (V7.4.3) and wanted to use MSSQL server (2019) as datasource.
After entering the Server, database, user, password, etc. I clicked ‘Save & test’.
Then it shows ‘Testing…’ for longer time and then its shows ‘EOF’:

grafana.log says nothing to this issue.

What I am missing?