Microsoft Download Center Archive

Microsoft Application Request Routing Version 3 for IIS

  • Published:
  • Version: 3.0
  • Category: Application
  • Language: English

Microsoft Application Request Routing (ARR) 3 for IIS is a proxy based routing module that forwards HTTP requests to application servers based on HTTP headers and server variables, and load balance algorithms.

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    Microsoft Application Request Routing (ARR) for IIS is a proxy-based routing module that forwards HTTP requests to application servers based on HTTP headers, server variables, and load balance algorithms.

    ARR Version 3 is an incremental release that includes all of the features from Version 2, and adds the following features:
  • Websocket support

  • Support for application-triggered session affinity opt out

  • failcheck reliability improvements

  • Various bug fixes

  • ARR version 3 and previous released cannot be installed side-by-side.

    More details can be found on


Status: Deleted

This download is no longer available on The downloads below are archives provided by the Internet Archive Wayback Machine from the Microsoft Download Center prior to August 2020.

SHA1: be34d5d338b260b351c4762f6ede2de3bb844f99
1.62 MB
SHA1: 0375e33051966c7028d5e023d6d70e01aa82a714
1.32 MB

System Requirements

Operating Systems: Windows Server 2008, Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2

  • Internet Information Services 7.0 or later must be installed
  • For WebSockets support, Internet Information Services 8.0 or later is required, and the WebSockets module must be enabled

Installation Instructions

  • ARR is dependent on several components:
  • URL Rewrite

  • Web Farm Framework

  • External Cache module

  • Do not attempt to install this package directly due to this dependency. To install ARR and all its components in the appropriate order, use the Microsoft Web Platform Installer ( and search for ARR within it. Alternatively, read the following blog post for instructions on installing ARR manually: