Frequently Asked Questions

If your IKEv2 VPN connection stopped working after upgrading to macOS 26 Tahoe, you're not alone. Apple has removed support for several legacy encryption, integrity, and key exchange algorithms in the built-in macOS VPN client. These include DES, 3DES, SHA1-96, SHA1-160, and older Diffie-Hellman groups (e.g., Group 2). As a result, macOS now fails to negotiate VPN connections that rely on these algorithms, often showing errors like “No acceptable proposal found” or “IKEv2 negotiation failed.”

This change breaks compatibility with many VPN gateways and firewalls—especially older models from vendors like Cisco, SonicWall, and Fortinet. Unfortunately, Apple does not offer a way to re-enable support for these deprecated settings.

The good news: VPN Tracker 365 still supports these legacy configurations and can restore compatibility without requiring changes on your VPN gateway. You can follow this step-by-step guide to get your VPN connection working again.