Dynamic Challenge in openVPN

Dynamic Challenge-Response Authentication in OpenVPN TL;DR — OpenVPN's dynamic challenge-response mechanism lets a VPN server send a real-time prompt to the client during the authentication handshake — think OTP codes, hardware token PINs, or MFA push confirmations. By enabling the management interface on both client and server, you can programmatically intercept the challenge, deliver it to the user, collect their response, and feed it back into the connection flow. Challenges travel as a base6