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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.
IMPORTANT - Changes in this release
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Windows 10 Support - It is now possible to install ARR 3 on Windows 10 with this release
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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:
- Weighted Total Traffic
- Least Current Request
- Least Response Time
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Buffering on SignalR responses is now disabled.
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Logging improvements made to help diagnose why requests failed with Status Code 502.3
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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 System
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
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- 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
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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 (http://www.microsoft.com/web/downloads/platform.aspx) and search for ARR within it. Alternatively, read the following blog post for instructions on installing ARR manually: http://blogs.technet.com/b/erezs_iis_blog/archive/2013/11/27/installing-arr-manually-without-webpi.aspx
