Microsoft fixes Always On VPN failures caused by September updates

Microsoft has resolved Always On VPN connection failures triggered by the September 2026 Windows 11 security updates. The fix ships in the KB5127936 preview update after Microsoft mistakenly flagged the issue as fixed in October cumulative updates.

• Failures hit automatic protocol selection with IKEv2 and SSTP
• VPNs stuck in Connecting state or threw a port-in-use error
• Fix is included in the KB5127936 preview update
• Workaround is to pick a single protocol: SSTP or IKEv2