Introduction

Hosting an ASP.NET 5 application on Internet Information Services (IIS) is a common requirement for organizations running applications on Windows servers. ASP.NET 5, part of the .NET Core family, is a cross-platform, high-performance framework optimized for modern web applications. IIS offers a rich set of features to enhance application security, scalability, and manageability. This article provides a comprehensive guide on how to host an ASP.NET 5 project on IIS, with insights into configurations and optimizations.

Prerequisites

Before setting up an ASP.NET 5 application on IIS, ensure the following prerequisites are met:

• Windows Server with IIS installed.
• ASP.NET Core Runtime installed on the server. You can download it from the .NET Download page.
• A published ASP.NET 5 application.

Step-by-Step Guide to Hosting on IIS

Installing IIS on Windows

To host an ASP.NET 5 application, IIS must be installed:

1. Open Server Manager and navigate to `Manage > Add Roles and Features`.
2. Select the Installation Type as Role-based or feature-based installation.
3. Choose the Destination Server.
4. Select Server Roles and check the box for `Web Server (IIS)`.
5. Add Features if prompted, then proceed.
6. Continue through the Wizard, ensuring that the default features for IIS are selected.
7. Install the role and restart the server if necessary.

Installing ASP.NET Core Hosting Bundle

This bundle comprises the .NET Core Runtime, .NET Core Library, and the ASP.NET Core Module. It is vital as the ASP.NET Core Module lets ASP.NET Core apps work behind IIS and regular .NET Framework apps:

1. Download the latest ASP.NET Core Hosting Bundle from the .NET Downloads page.
2. Run the Installer and follow the instructions.

Publishing the ASP.NET 5 Application

1. Build your application in Visual Studio using `Release` mode.
2. Right-click the project in Visual Studio and select `Publish`.
3. Choose Folder as the publish target.
4. Set the target path where the application will be published.
5. Click Publish.

Configuring IIS

1. Open IIS Manager (run `inetmgr`).
2. Right-click the Sites node and select `Add Website`.
3. Configure the Website parameters:
   • Site name: Choose a unique name.
   • Physical path: Select the folder where the application is published.
   • Binding: Configure the type (HTTP/HTTPS) and port.

Configuration Example:

Below is an example of a `web.config` file in ASP.NET 5 to integrate with IIS:

• Start the Website in IIS and test it by navigating to the configured address (e.g., `http://localhost:port\`).
• Check Event Logs or stdout logs from `web.config` if any issues arise.
• 500 Internal Server Error: Often results from misconfigurations in the `web.config` or issues in the app. Review logs for specific error messages.
• Application Not Starting: Ensure the ASP.NET Core Hosting Bundle is installed correctly. Check the `stdout` logs for errors during the app's startup.
• Port Conflicts: Ensure the specified port in the binding is open and not being used by another application.
• Compression and Caching: Utilize IIS's built-in support for HTTP compression and caching to improve application performance.
• Application Pool: Assign a dedicated Application Pool for your ASP.NET Core application for isolation and better resource management.
• Security: Configure Windows Authentication if needed and ensure your application adheres to security best practices.