You can uninstall the updates with an elevated command prompt. It's the simple strategy of uninstalling KB5009543 and KB5008876 and living without their security updates until patches come along that don't mess with VPN connections. The fix, for the time being, is straightforward, though it doesn't come from Microsoft. Rather, it's seeming to hit those using Windows' built-in VPN client. It's worth noting this unintended side effect of Patch Tuesday isn't affecting all VPN users. The message users get hit with when attempting connections reads "the L2TP connection attempt failed because the security layer encountered a processing error during initial negotiations with the remote computer." Windows admins over on Reddit are reporting the issue affects SonicWall and WatchGuard connections, among others (via BleepingComputer).
But while the updates helped alleviate Windows of numerous vulnerabilities, they've also had the unforeseen consequence of borking some PC users' VPN connections.
Ugh.In case you missed it, January 2022's Patch Tuesday came and went, bringing with it fresh updates for Windows 11 and Windows 10. Their solution is frustratingly "you can just use Mobile Connect".
I do see in the registry, that the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\DeviceGuard\Scenarios\HypervisorEnforcedCodeIntegrity\Enabled is set to 0, so maybe it is off and the GUI is just bugged.Įither way, the NetExtender is not working. You turn it off through the GUI, reboot as directed, but it comes back up showing that it's back on. Sonicwall support said that there's a known issue with the latest build of Windows where you have to disable Memory Integrity under Core Isolation (Windows Settings), but on the affected PC, you can't seem to turn it off. The nxcleaner.exe tool does not help either. I cannot stop, disable or remove this service. There's a Windows service running now that I haven't see with older versions of NX. I have a new PC for a client Win 10 Pro, 20H2.Īfter reboot, NX would not start saying the installation was damaged.
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