macOS Sequoia change breaks networking for VPN, antivirus software

macOS 15 “Sequoia” introduces networking/firewall changes that are breaking connectivity for some EDR (e.g., CrowdStrike, ESET), VPNs (e.g., Mullvad, some corporate VPNs), and web browsers, with issues linked to deprecation of plist-based Application Firewall settings in favor of the `socketfilterfw` tool and reports of UDP/DNS handling problems. Vendors advise postponing upgrades or applying workarounds (e.g., removing the ESET Network filter on supported versions), while Chromium and Mullvad acknowledge the issues and are working on fixes; ProtonVPN reportedly remains unaffected.