Microsoft released an important out-of-band (OOB) optional update on January 18 to fix several issues. These include VPN connectivity issues introduced with the recent Patch Tuesday updates for Windows 10 and Windows 11. You can get updates through Settings > Windows Update & Security, or choose to download them independently through Microsoft’s Update Catalog.
About VPN connection issues:
After installing KB5009566, IP Security (IPSEC) connections with Vendor ID may fail. VPN connections using Layer 2 Tunneling Protocol (L2TP) or IP Secure Internet Key Exchange (IPSEC IKE) may also be affected.
In addition to VPN connectivity issues, this new update fixes Windows Server domain controller restart issues, virtual machine startup failures in Hyper-V issues, and Resilient File System (ReFS) formatted removable media mount failure errors. This is what we detailed before fixing it here.
The following updates, delivered with the appropriate Windows version, are designed to fix these issues.
KB5010795 for Windows 11 version 21H1 (original)
KB5010796 for Windows Server 2022
KB5010793 for Windows 10 version 21H2
KB5010793 for Windows 10 version 21H1
KB5010793 for Windows 10, Version 20H2, Windows Server, Version 20H2
KB5010793 for Windows 10, Version 20H1, Windows Server, Version 20H1
KB5010792 for Windows 10 version 1909, Windows Server version 1909
KB5010790 for Windows 10 version 1607, Windows Server 2016
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