The Authentication Proxy performance testing used Amazon Web Services (AWS) m4(Intel(R) Xeon(R) CPU E5-2686 v4) instances. For example, the effective authentication rates for various combinations on a Linux server will be: Linux Proxy Configuration

Note that use of LDAP or TLS on Linux decreases the authentication rate by 250 auths/minute on each side. Use this guidance as you design your Authentication Proxy server deployment. Installation Authentication Proxy Performance Recommendations In addition to providing two-factor authentication, the Duo Authentication Proxy is a required component for importing Active Directory or OpenLDAP users into Duo via sync, Active Directory authentication for Duo Single Sign-On, and can also act as an HTTP proxy itself for other systems that also need to contact Duo's cloud service.

If your organization requires IP-based rules, please review this Duo KB article. 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.

The Authentication Proxy communicates with Duo's service on TCP port 443.

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