Configure Cisco ASA VPN to Interoperate with Okta via RADIUS

This guide details how to configure Cisco ASA VPN to use the Okta RADIUS Server Agent.

Okta and Cisco ASA interoperate through RADIUS. For each Cisco ASA appliance, you can configure AAA Server groups which can be RADIUS, TACAS+, LDAP, etc. Using RADIUS, Okta’s agent translates RADIUS authentication requests from the VPN into Okta API calls.

Before you begin

Before installing the Okta RADIUS Agent ensure that you have met these minimum requirements for network connectivity:

Source	Destination	Port/Protocol	Description
Okta RADIUS Agent	Okta Identity Cloud	TCP/443 HTTP	Configuration and authentication traffic
Client Gateway	Okta RADIUS Agent	UDP/1812 RADIUS (Default, may be changed in RADIUS app install and configuration)	RADIUS traffic between the gateway (client) and the RADIUS Agent (server)

Supported factors

The following MFA Factors are supported:

When integrating with Okta RADIUS, the maximum supported number of enrolled factors is dependent on the size of resulting challenge message. Okta recommends that no more than eight ( 8 ) be enrolled at one time.

MFA Factor	Password Authentication Protocol PAP	Extensible Authentication Protocol - Generic Token Card EAP-GTC	Extensible Authentication Protocol - Tunneled Transport Layer Security EAP-TTLS
Custom TOTP Authentication	Supported	Supported	Supported
Duo(Push, SMS and Passcode only)	Supported	Not supported	Not supported
Email	Supported	Supported	Not supported
Google Authenticator	Supported	Supported	Supported - as long as challenge is avoided. For example MFA only or password, MFA.
Okta Verify (TOTP and PUSH)	Supported	Supported	Supported - as long as challenge is avoided. For example: MFA-only or password, MFA for TOTP. Push can work with primary auth + MFA as the push challenge is sent out-of-band.
RSA Token	Supported	Supported	Supported
Security Question	Supported	Supported	Not supported
SMS authentication	Supported	Supported	Not supported
Symantec VIP	Supported	Supported	Supported
Voice Call	Supported	Supported	Not supported
YubiKey	Supported	Supported	Supported

EAP-TTLS does not support enrollment
Authentication will fail unexpectedly when EAP-TTLS is enabled, either Okta Verify or Phone are specified as required enrollment policy, and the user is not enrolled in that factor.

Note

The U2F Security and Windows Hello MFA factors are not compatible with RADIUS-enabled implementations.
For additional information about the RADIUS apps refer to Configuring RADIUS applications in Okta.

Typical workflow

Task	Description
Download the RADIUS agent	Download the Okta RADIUS Agent from the Settings > Downloads page your in Okta org. Note that there are both Windows and Linux agents. For throughput, availability and other considerations, see Okta RADIUS Server Agent Deployment Best Practices.
Install the Okta RADIUS Agent.	Install either the Windows or Linux RADIUS agents as appropriate for your environment.
Configure application	In your Okta org, configure the Cisco ASA - RADIUS application.
Configure gateway	Using the Cisco ASA Admin Console, configure the Cisco ASA gateway.
Configure optional settings	Configure optional settings as required, such as vendor specific attributes.
Test	Test the newly integrated agent.

Configure Cisco ASA VPN to Interoperate with Okta via RADIUS

Topics

Before you begin

Supported factors

Typical workflow

Related topics