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Microsoft Application Request Routing 3.0 (x64)

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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  • Version:


    Date Published:


    File Name:


    File Size:

    2.4 MB

    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.

    IMPORTANT - Changes in this release
    • Windows 10 Support - It is now possible to install ARR 3 on Windows 10 with this release
    • Web Farm Framework 1.1 is no longer required, Application Request Routing no longer has a dependency on Web Farm Framework 1.1
    • Changes to load balancing algorithms available. The following algorithms have been REMOVED from Application Request Routing:
      1. Weighted Total Traffic
      2. Least Current Request
      3. Least Response Time
    • Buffering on SignalR responses is now disabled.
    • Logging improvements made to help diagnose why requests failed with Status Code 502.3
    • This release also incorporates fixes in KB3016062

    Click the Download button on this page to start the download, then do one of the following:
    • To start the installation immediately, click Open or Run this program from its current location.

    • To copy the download to your computer for installation at a later time, click Save or Save this program to disk.

  • Supported Operating Systems

    Windows Server 2008, Windows Server 2016, Windows 10, Windows Server 2012 R2, Windows Server 2008 R2, Windows Server 2012 Standard, Windows Server 2019, Windows Server 2022

    • 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
  • ARR is dependent on several components:
  • URL Rewrite

  • 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:
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