Microsoft fixes Patch Tuesday bug that broke VPN in Windows 10 and 11

Microsoft fixes Patch Tuesday bug that broke VPN in Windows 10 and 11



Microsoft fixes Patch Tuesday bug that broke VPN in Windows 10 and 11

Aurich Lawson

Microsoft’s monthly Patch Tuesday updates for Windows are generally meant to fix problems, but that isn’t how it always goes. January’s updates, released last week, caused a handful of problems for businesses in particular. The most serious, especially for people still dealing with pandemic-driven remote-work setups, was a bug that broke certain kinds of VPN connections. Microsoft has provided fixes for this and other issues as of today, a few days after acknowledging the problem on its Known Issues page.

According to Microsoft’s documentation and reporting from Bleeping Computer, the VPN connection issues affected “IPSEC connections which contain a Vendor ID,” as well as L2TP and IPSEC IKE VPN connections in Windows 10, Windows 11, and Windows Server versions 2022, 20H2, 2019, and 2016. Windows’ built-in VPN client seems to be the most commonly affected, but third-party VPN clients using these kinds of connections could also run into the error.

The latest round of Patch Tuesday updates also caused some problems for Windows Server, including unexpected reboots for domain controllers and failed boots for Hyper-V virtual machines. These problems have all been resolved by other out-of-band patches, though not before causing problems for beleaguered IT admins.

Microsoft has also resolved a problem that caused ReFS-formatted drives to not show up at all or to show up as raw, unformatted disks. Microsoft has also fixed this problem, though not before blaming the problem on the “unsupported” use of ReFS on removable drives. The ReFS filesystem was supported in the consumer versions of Windows for a few years, though Microsoft removed the ability to create ReFS drives a few years ago, restricting it to servers and the enterprise editions of Windows.



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