Setting environment variables for asp.net core when publishing on IIS

• Open the IIS Manager and select your website
• Open “Configuration Editor” from “Management” section

• On the first dropdown (section), select “system.webServer/aspNetCore”
• On the second (from), select web.config

• Then select “environmentVariables”, click on the “…” and use the add/remove buttons to configure as you want.

(ASPNETCORE_ENVIRONMENT is the appsettings.json environments)