The applications that you deploy may require a set of supportive services, such as Message Queuing or Distributed Transactions support. The section of the Add Roles Wizard that adds the Application Server role includes a page for selecting the role services that are required to run your applications.

You can install the following role services, or support for these services, during Application Server installation:

  • Web Server (IIS) support: Application Server uses Web server support through Internet Information Services (IIS) to host internal or external Web sites and Web services that communicate over Hypertext Transfer Protocol (HTTP). This includes support for applications that are built on Microsoft ASP.NET that can be accessed through a Web browser. It also includes support for Web services that are built with Windows Communication Foundation (WCF). For more information, see Web Server (IIS) Support for Application Server.

  • COM+ Network Access: Application Server uses COM+ Network Access to host and allow remote invocation of applications that are built with COM+ and Enterprise Services components. For more information, see COM+ Network Access and Application Server.

  • TCP Port Sharing: TCP Port Sharing facilitates the sharing of TCP ports across multiple processes that use WCF for communications. The default TCP port for sharing is port 808. For more information, see TCP Port Sharing and Application Server.

  • Windows Process Activation Service support: Application Server uses Windows Process Activation Service (WAS) support to invoke applications remotely over the network using protocols such as HTTP, Message Queuing, TCP, and Named Pipes. For more information, see Windows Process Activation Service Support for Application Server.

  • Distributed Transactions: Distributed Transactions helps ensure complete and successful transactions over multiple databases that are hosted on multiple computers on your network. For more information, see Distributed Transaction Support for Application Server.


Some role services require the installation of a supporting feature or set of features. If this is the case, you have the option to install or not install the required feature or set of features.