This article describes [Visual Studio](https://www.visualstudio.com/vs/) support for debugging ASP.NET Core apps running behind IIS on Windows Server. This topic walks through enabling this feature and setting up a project.
* A host name that matches the app's launch profile URL host name.
* Binding for port 443 with an assigned certificate.
For example, the **Host name** for an added website is set to "localhost" (the launch profile will also use "localhost" later in this topic). The port is set to "443" (HTTPS). The **IIS Express Development Certificate** is assigned to the website, but any valid certificate works:
If the IIS installation already has a **Default Web Site** with a host name that matches the app's launch profile URL host name:
* Add a port binding for port 443 (HTTPS).
* Assign a valid certificate to the website.
## Enable development-time IIS support in Visual Studio
1. Launch the Visual Studio installer.
1. Select the **Development time IIS support** component. The component is listed as optional in the **Summary** panel for the **ASP.NET and web development** workload. The component installs the [ASP.NET Core Module](xref:fundamentals/servers/aspnet-core-module), which is a native IIS module required to run ASP.NET Core apps behind IIS in a reverse proxy configuration.
For a new project, select the check box to **Configure for HTTPS** in the **New ASP.NET Core Web Application** window:
In an existing project, use HTTPS Redirection Middleware in `Startup.Configure` by calling the [UseHttpsRedirection](/dotnet/api/microsoft.aspnetcore.builder.httpspolicybuilderextensions.usehttpsredirection) extension method:
```csharp
public void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
else
{
app.UseExceptionHandler("/Error");
app.UseHsts();
}
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseCookiePolicy();
app.UseMvc();
}
```
### IIS launch profile
Create a new launch profile to add development-time IIS support:
1. For **Profile**, select the **New** button. Name the profile "IIS" in the popup window. Select **OK** to create the profile.
1. For the **Launch** setting, select **IIS** from the list.
1. Select the check box for **Launch browser** and provide the endpoint URL. Use the HTTPS protocol. This example uses `https://localhost/WebApplication1`.
1. In the **Environment variables** section, select the **Add** button. Provide an environment variable with a key of `ASPNETCORE_ENVIRONMENT` and a value of `Development`.
1. In the **Web Server Settings** area, set the **App URL**. This example uses `https://localhost/WebApplication1`.
1. Save the profile.
