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Duo for Microsoft RD Web and RD Gateway - Release Notes

Last Updated: May 29th, 2025

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Download the current release from the Checksums and Downloads page.

Support for Windows Server 2008 R2 ended in January 2020. Future releases may not function on unsupported operating systems.

Duo for Remote Desktop Web

Version 3.1.0 - May 29, 2025

  • Adds support for new Duo certificate authorities.
  • Adds the Duo Secret Key Rotation tool in the RD Web installation directory to assist administrators with updating the application's secret key to a new value when required.
  • Adds encryption to the secret key in the Windows Registry.
  • Adds Skey rotation tool path: "C:\Program Files\Duo Security\DuoRDWeb\DuoSecretKeyRotation.exe".

Version 3.0.0 - January 29, 2024

  • Duo Universal Prompt support with OIDC standards-based redirects. The Duo Prompt no longer loads in an iframe. Learn more about the move to frameless authentication in preparation for Duo Universal Prompt.
  • The installer now defaults to "fail closed" for new installations and upgrades to v3.0.0. Upgrades from v3.0.0 to future releases will preserve the installed fail mode selection.
  • TLS 1.2 is now the minimum supported version. Drops support for TLS 1.1, 1.0, and SSLv3.
  • Fixes an issue with IIS proxy bypass parsing.
  • Corrects an issue with usernames using an alternative UPN suffix.
  • We now use enhanced strong naming for Duo generated .NET Assemblies.
  • Changes the registry values IKey and SKey to Client_Id and Client_Secret.

Version 2.3.0 - April 11, 2018

  • Support for UPN usernames.
  • Windows 2012 and later installations now require .NET Framework 4.5 and ASP.NET 4.5.
  • TLS 1.1 and 1.2 support for Windows 2012 and later.

Version 2.2.1 - October 2, 2017

  • Duo Web SDK 2.6.

Version 2.2.0 - August 2016

  • Deprecated installation of unified authentication.
  • Supports Windows Server 2016.

Version 2.1.2 - June 2016

  • Fixed unified authentication installer issue for localized Windows server editions.

Version 2.1.1 - January 2016

  • Improved user lookup and RDS host resolution.

Version 2.1.0 - Aug 2015

  • Windows 2012 and 2012 R2 support.
  • Introduces new "Unified Authentication" mode.
  • Changes the Duo RD Web registry key location to HKLM\Software\Duo Security\DuoRdweb.

Version 1.1.2 - Feb 2014

  • Fixed several installer issues.
  • Improved handling of redirects to Duo login form.

Version 1.0.2 - Oct 2013

  • Initial Release.

Duo for Remote Desktop Gateway

Version 2.3.1 - March 24, 2025

  • Adds the new Duo Secret Key Rotation tool in the RD Gateway installation directory to assist administrators with updating the application's secret key to a new value when required.
  • Security fixes.
  • Bug fixes.
  • Supports Windows Server 2025.

Version 2.3.0 - April 11, 2018

  • Support for UPN usernames.
  • Windows 2012 and later installations now require .NET Framework 4.5 and ASP.NET 4.5.
  • TLS 1.1 and 1.2 support for Windows 2012 and later.

Version 2.2.0 - August 2016

  • Deprecated installation of unified authentication.
  • Supports Windows Server 2016.

Version 2.1.0.12 - Aug 2015

  • Introduces new "Unified Authentication" mode.
  • Configurable idle and session timeouts.

Version 2.0.2 - June 2014

  • Converted to Microsoft pluggable authentication.
  • Changes the Duo RD Gateway registry key location to HKLM\Software\Duo Security\DuoTsg.

Version 1.0.2 - Oct 2013

  • Initial Release.