Microsoft releases emergency KB5010196 and KB5010215 updates to fix serious remote desktop problems in Windows Server
Microsoft has issued an out-of-band update for Windows Server to address a problem with Remote Desktop that can prevent connections to a server.
There are two different updates available at the moment -- KB5010196 for Windows Server 2019, and KB5010215 for Windows Server 2012 R2 -- and Microsoft says that updates will be released for other affected platforms "in the coming days". As these are emergency, out-of-band updates, they are not currently available from Windows Update, and must instead be installed manually.
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Microsoft says of the update: "Addresses a known issue that might prevent you from using Remote Desktop to reach the server. In some circumstances, the server might stop responding. The screen might also appear black, and general performance and signing in might be slow".
On the release health page, the company also says:
Take action: Out-of-band update to address a Windows Server issue
Microsoft is releasing Out-of-band (OOB) updates today, January 4, 2022, to resolve issues in which Windows Server might experience a black screen, slow sign in, or general slowness on Windows Server 2019 and Windows Server 2012 R2. The remaining affected platforms will be released in the coming days. To get the standalone update package, search for it in the Microsoft Update Catalog. You can import this update into Windows Server Update Services (WSUS) manually. See the Microsoft Update Catalog for instructions. Note These updates are not available from Windows Update and will not install automatically.
You can find out more about the out-of-band updates here, and download them here: