<connectionStrings> <add name="dbContext" connectionString="Server=127.0.0.1;Port=5432;Database=postgres;UserId=postgres;Password=postgres;Timeout=60;" providerName="Npgsql" /> </connectionStrings> <system.data> <DbProviderFactories> <remove invariant="Npgsql" /> </remove></dbproviderfactories></system.data>