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DUO with DUO Proxy firewall ports requirnments

Alan Tang
Level 1
Level 1

Hello:

I am implementing the DUO 2-FA with DUO Proxy. May I know the firewall port requirements for those custom application and Microsoft Remote Desktop Agent communicate with DUO Proxy? Is only port 443 was enough?

For the DUO Proxy to Cisco DUO Cloud (Internet), I just release port 443 for internet access is fine?

Thanks!

2 Replies 2

DuoKristina
Cisco Employee
Cisco Employee

Do you mean Duo Authentication for Windows Logon when you say "Microsoft Remote Desktop Agent"?

When installed, Duo Authentication for Windows Logon attempts to contact Duo's cloud service via HTTPS on port 443.

If you configure a web proxy on that system using netsh, then it will use whatever port you specified in the netsh config: https://duo.com/docs/rdp-faq#does-duo-authentication-for-windows-logon-support-web-proxying?

If you configure a proxy for only Duo traffic using an upstream Duo Authentication Proxy, then it uses whatever port you specify in the config (default 80): https://duo.com/docs/rdp-faq#is-it-possible-to-use-a-web-proxy-only-for-duo-authentication-for-windows-logon-traffic?

Duo, not DUO.