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btan
Staff & Editor
Staff & Editor
April 14, 2025

Troubleshooting Tip: When connecting to certificate-based authentication SSL VPN or IPsec VPN with Smart Card as Multifactor authentication (MFA), FortiClient does not prompt for MFA

  • April 14, 2025
  • 0 replies
  • 923 views
Description This article describes how to resolve the issue when connecting to a certificate-based authentication SSL VPN or IPsec VPN with Smart Card as Multifactor authentication (MFA), FortiClient does not prompt for MFA.
Scope FortiClient v7.0.9+, v7.2, v7.4.
Solution

After upgrading FortiClient to versions 7.0.9, 7.2.x, or 7.4.x, when connecting to certificate-based authentication, SSL VP,N or IPsec VPN with Smart Card as Multifactor authentication (MFA), FortiClient does not prompt for MFA. This results in the VPN stopping at 40% and not being connected:


apr-kb2-1.PNG

 

Checking in FortiClient Notification, it shows 'Permission denied. (-455)' error:

 

apr-kb2-2.PNG

 

To resolve this, go to EMS -> Endpoint Profile -> Remote Access -> (select the profile) -> Edit -> XML view, add the configuration <async_mode>1</async_mode> in the VPN tunnel section, and save the profile.

 

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Note: This solution is applicable for both SSL VPN and IPsec VPN tunnels.

 

Once the endpoint machine is synced with the profile, FortiClient will now prompt for Smart Card MFA PIN, and VPN can now be connected.