Windows Server 2022 Ltsc 21h2 X64 English Decem Updated May 2026

For administrators deploying the "Decem Updated" image (media fresh install or patching):

For security auditors and CISOs, the December 2024 update for Windows Server 2022 LTSC 21H2 introduced four major security posture changes.

The December cumulative update (typically identified by a KB number, such as KB5033375 for the December 2023 Patch Tuesday, depending on the specific year you are referencing) focuses heavily on security and reliability. windows server 2022 ltsc 21h2 x64 english decem updated

Symptoms: 30-45 second delay logging in via Remote Desktop.

Cause: The December update changed the credential guard default behavior. Then restart the TermService service

Fix:

reg add "HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server\WinStations\RDP-Tcp" /v UserAuthentication /t REG_DWORD /d 0 /f

Then restart the TermService service.

This is the base product. Released in August 2021, Windows Server 2022 represents the next generation of Microsoft’s server OS family. It brought significant advancements over Server 2019, including:

No update is perfect. The December 2024 release had two documented known issues: windows server 2022 ltsc 21h2 x64 english decem updated

Cluster Validation – In certain storage configurations, the cluster validation wizard would falsely flag SMB direct compatibility.

Pro tip: Use the Microsoft Update Catalog (catalog.update.microsoft.com) to search for "Windows Server 2022 21H2 x64" and sort by "Last Updated" to find builds that supersede the December 2024 release.