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.