Microsoft fixes Always On VPN failures from September Windows 11 updates
Original title: Microsoft finally fixes VPN issues caused by September updates
KB5127936 stops connections stuck on Connecting or reporting a port already in use; a single-protocol workaround remains.
Microsoft resolved Always On VPN connection failures that began after the September 2026 Windows 11 security updates when automatic protocol selection or fallback used IKEv2 and SSTP. It had incorrectly marked the issue fixed in the October 2026 cumulative updates. The fix is in this month’s KB5127936 preview update. Admins who wait for the next Patch Tuesday can force SSTP only or IKEv2 only. The same preview also restores Remote Desktop for non-admin users when Administrator protection is enabled.
- Failures could leave VPN sessions stuck in Connecting.
- Some retries showed the error “The specified port is already in use.”
- Microsoft first flagged the issue to admins in late September.
- The Remote Desktop bug followed the September 2026 non-security preview or later updates.
Impact: Always On VPN connections fail or stay stuck connecting
| Product | Affected | Fixed in |
|---|---|---|
| Microsoft Windows 11 Always On VPN | after September 2026 Windows 11 security updates | KB5127936 |
- 1.Install the KB5127936 preview update.
- 2.Or set the Always On VPN profile to SSTP only or IKEv2 only until the next cumulative update.
- Vendors
- Microsoft
- Products
- Windows 11Always On VPNKB5127936
From the original article
2 min read at bleepingcomputer.com
Microsoft has resolved Always On VPN connection failures triggered after installing the September 2026 Windows 11 security updates. [...]
By Sergiu Gatlan · bleepingcomputer.com
A short excerpt; the article and its images belong to the publisher. Summary, key facts and assessment above are AI-written from the article and can be wrong.