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Users report that Cisco Duo 2FA fails when they attempt to connect to the VPN on a Cisco Secure Firewall Threat Defense (FTD) device IT staff have VPN profiles that do not require multifactor authentication and they can connect to the VPN without any issues When viewing the VPN troubleshooting log in Cisco Secure Firewall Management Centre (FMC), the network administrator sees an error in the Cisco Duo AAA server has been marked as tailed. What is the root cause of the Issue?

A.

Multifactor authentication Is not supported on Secure FMC managed devices.

Answers
A.

Multifactor authentication Is not supported on Secure FMC managed devices.

B.

Duo trust certificates are missing from the Secure FTD device.

Answers
B.

Duo trust certificates are missing from the Secure FTD device.

C.

The internal AD server is unreachable from the Secure FTD device.

Answers
C.

The internal AD server is unreachable from the Secure FTD device.

D.

AD Trust certificates are missing from the Secure FTD device.

Answers
D.

AD Trust certificates are missing from the Secure FTD device.

Suggested answer: B

Explanation:

If users report that Cisco Duo 2FA fails when attempting to connect to the VPN on a Cisco Secure Firewall Threat Defense (FTD) device, and the VPN troubleshooting log in FMC shows an error indicating that the Cisco Duo AAA server has been marked as failed, the root cause is likely missing Duo trust certificates on the FTD device. Trust certificates are essential for establishing a secure and trusted connection between the FTD and the Duo authentication service.

Steps:

Obtain the necessary Duo trust certificates.

Install the certificates on the FTD device.

Verify the configuration to ensure that the FTD device can properly communicate with the Duo AAA server.

This resolves the authentication failure by ensuring that the FTD device can trust the Duo server.

asked 07/10/2024
Sean Kell
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