macOS Sequoia change breaks networking for VPN, antivirus software

Users of macOS 15 'Sequoia' are experiencing network connection issues with various endpoint detection and response (EDR) and virtual private network (VPN) solutions, as well as web browsers. The problems arise from incompatibilities with the new networking structures introduced in this version, which was released on September 16, 2024. Affected users have reported issues with products like CrowdStrike Falcon and ESET Endpoint Security, leading to packet corruption and SSL failures. CrowdStrike has advised its customers against upgrading to macOS 15 until a compatible Mac sensor is available. Similarly, SentinelOne Support has also recommended postponing the upgrade due to usability concerns. While some VPNs like ProtonVPN are functioning correctly, others, including Mullvad VPN, are facing connectivity problems. ESET has provided a workaround for users experiencing connection losses, suggesting they remove ESET Network from their system settings. Security researchers have noted that the built-in firewall in macOS 15 is not handling UDP traffic properly, causing DNS failures. Users relying on EDR products, VPNs, or strict firewall configurations are advised to delay upgrading to macOS 15 until these issues are resolved.

- macOS 15 'Sequoia' causes network issues for EDR and VPN users.

- CrowdStrike and SentinelOne recommend against upgrading until compatibility is ensured.

- Some VPNs are functioning while others face connectivity problems.

- ESET provides a workaround for connection issues post-upgrade.

- Users should postpone upgrading if reliant on EDR or strict firewall settings.