Microsoft has released an emergency out-of-band (OOB) update for Windows Server 2019 that fixes numerous critical bugs introduced during the January 2022 Patch Tuesday.
Soon after Windows Server admins installed the January 2022 updates, they began reporting severe issues, including domain controllers entering into boot loops, Hyper-V no longer starting, L2TP VPN connections failing, and ReFS volumes becoming inaccessible.
The issues were severe enough that many admins chose to uninstall the updates and forgo the included security fixes so that their servers could operate correctly again.
OOB updates for all Server versions released
Yesterday, Microsoft released OOB updates for Windows Server 2022, Windows Server 20H2, Windows Server 20H1, Windows Server 2016, and Windows Server 2012 R2 to fix all of these issues.
Microsoft also released security updates for Windows 10, Windows 8, and Windows 7 operating systems to resolve the LT2P connection issues.
However, the KB5010791 OOB update for Windows 2019 was not ready yesterday and was finally released this evening with the following fixes:
Addresses a known issue that might cause IP Security (IPSEC) connections that contain a Vendor ID to fail. VPN connections using Layer 2 Tunneling Protocol (L2TP) or IP security Internet Key Exchange (IPSEC IKE) might also be affected.
Addresses a known issue that might cause Windows Servers to restart unexpectedly after installing the January 11, 2022 update on domain controllers (DCs).
Addresses an issue that prevents Active Directory (AD) attributes from being written properly during a Lightweight Directory Access Protocol (LDAP) modify operation when you make multiple attribute changes.
Addresses an issue that might prevent removable media that is formatted using the Resilient File System (ReFS) from mounting or might cause the removable media to mount in the RAW file format. This issue occurs after installing the January 11, 2022 Windows update.
The complete list of the OOB updates released to fix the January 2022 bugs are listed below.
The following updates can only be downloaded and installed via the Microsoft Update Catalog:Windows 8.1, Windows Server 2012 R2: KB5010794 Windows Server 2012: KB5010797
Updates for the following Windows versions are also available through Windows Update as an optional update:Windows 11, version 21H1 (original release): KB5010795 Windows Server 2022: KB5010796 Windows 10, version 21H2: KB5010793 Windows 10, version 21H1: KB5010793 Windows 10, version 20H2, Windows Server, version 20H2: KB5010793 Windows 10, version 20H1, Windows Server, version 20H1: KB5010793 Windows 10, version 1909, Windows Server, version 1909: KB5010792 Windows Server 2019: KB5010791 Windows 10, version 1607, Windows Server 2016: KB5010790 Windows 10, version 1507: KB5010789 Windows 7 SP1: KB5010798 Windows Server 2008 SP2: KB5010799
Windows Server admins who installed yesterday's OOB updates report that they fixed the issues with the January updates.