Firewall configurations that restrict outbound access to Duo's service with rules using destination IP addresses or IP address ranges aren't recommended, since these may change over time to maintain our service's high availability. This application communicates with Duo's service on TCP port 443. Read the enrollment documentation to learn more. You'll need to create your users in Duo ahead of time using one of our other enrollment methods, like directory sync or CSV import. This configuration doesn't support inline self-service enrollment. Once configured, Duo sends your users an automatic authentication request via Duo Push notification to a mobile device or phone call after successful primary login. This Duo proxy server also acts as a RADIUS server - there's usually no need to deploy a separate additional RADIUS server to use Duo.
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To integrate Duo with your Microsoft TMG server, you will need to install a local proxy service on a machine within your network. These installation instructions remain available as a reference for Duo customers who configure TMG with Duo before February 21, 2022. Review the Duo End of Sale, Last Date of Support, and End of Life Policy.
Microsoft Threat Management Gateway (TMG) reached Microsoft's end of support in April 2020. Duo integrates with your Microsoft TMG Server to add two-factor authentication to any published web server or SSL VPN Connections.