Plesk ConnectionsStrings MSSQL

Hi, 

I wrote some code using asp.net core (using .net framework). Use EF to design my DB. Localy everything work!

In plesk i import the dump of the DB (export using MSSQL Management Studio).

The app runs ok but now i dont know to connect the WebApp to the DB on the sever.

I already read somestuff and try over and over without success... The other problems is where are the system errors log in plesk? 

Thanks.

web.config

<?xml version="1.0" encoding="utf-8"?><configuration><!--
    Configure your application settings in appsettings.json. Learn more at http://go.microsoft.com/fwlink/?LinkId=786380
  --><system.webServer><handlers><add name="aspNetCore" path="*" verb="*" modules="AspNetCoreModule" resourceType="Unspecified" /></handlers><aspNetCore processPath=".\TopElite.exe" arguments="" stdoutLogEnabled="false" stdoutLogFile=".\logs\stdout" forwardWindowsAuthToken="false" /></system.webServer></configuration><!--ProjectGuid: 13762a19-33de-4009-a429-3bbe7bec566d-->

appsettings.json

{"ConnectionStrings": {"DefaultConnection": "Server=(localdb)\\mssqllocaldb;Database=aspnet-TopElite-d355b606-79b4-4d73-b05d-d761e4ec05ee;Trusted_Connection=True;MultipleActiveResultSets=true"
  },"Logging": {"IncludeScopes": false,"LogLevel": {"Default": "Debug","System": "Information","Microsoft": "Information"
    }
  }
}

Informations

Host             .\MSSQLSERVER2016
Database name    AAA
User name        USER
Password         PASS

And in the database myLittleAdmin i get this

Connection

Connection string: Data Source=.\MSSQLSERVER2016;Integrated Security=False;User ID=USER;Connect Timeout=15;Encrypt=False;Packet Size=4096
Connection timeout: 15
Database: master
Datasource: .\MSSQLSERVER2016
Network packet size: 4096
Server version: 13.00.1601
Work station id: CP82