I installed Free SQL Health Monitor and configured 2 servers. I provided an NT domain ID and password that has SQL user access. SQL Health is able to find the servers and display the WMI data, but it does not display any SQL-specific data (SQL Server Version = Not Available on the Server Details entry, and the SQL Server and Databases entries both say Not Available. The Services entry displays 5 running SQL services.
Both servers behave the same.
SQL Server version on the remote servers is 2014.