This application communicates with Duo's service on TCP port 443.
Duo application features like failmode, offline access, and UAC protection may be configured during installation or post-installation via Regedit or Group Policy. Installing Duo for Windows Logon on these devices may block logins, requiring uninstallation from Safe Mode. This application doesn't support Surface Pro X or other devices with ARM processors. It's a good idea to have your BitLocker recovery key available in the event you need to boot into safe mode to uninstall Duo. Users with blank passwords may not login after Duo Authentication installation. Windows users must have passwords to log in to the computer. See Can I Use Duo with a Microsoft Account? for more information. 
Additional configuration may be required to log in using a Microsoft attached account. If you wish to protect local console logons with Duo, please see the FAQ for some guidance on securing your Windows installation appropriately. If two-factor is enabled for both RDP and console logons, it may be bypassed by restarting Windows into Safe Mode (e.g. 
Installing Duo Authentication for Windows Logon adds two-factor authentication to all interactive user Windows login attempts, whether via a local console or over RDP, unless you select the "Only prompt for Duo authentication when logging in via RDP" option in the installer. Please review all these compatibility and installation notes before proceeding. Pre-Logon Access Providers (PLAPs) such as Windows Always On VPN. 
Log on as a Service, Log on as Batch, Scheduled Tasks, drive mappings, etc.)
PowerShell "Enter-PsSession" or "Invoke-Command" cmdlets. Shift + right-click "Run as different user". Right-click + "Run as administrator") in v4.1.0 and laterĭuo's Windows Logon client does not add a secondary authentication prompt to the following logon types: Credentialed User Access Control (UAC) elevation requests (e.g. 
Logins at the local console and/or incoming Remote Desktop (RDP) connections. Be sure to read through these instructions before you download and install Duo for Windows Logon.ĭuo Authentication for Windows Logon adds Duo two-factor authentication to these Windows and Windows Server logon scenarios:
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