Windows Server 2022 - Windows Update error - STATUS_SXS_ASSEMBLY_MISSING - Microsoft-Windows-Slb-Mux-Package

Xavier 21 Reputation points

Hello Team,

I have problems to push last Cumulative Updates Server Operating System KB5018421 (2022-10) and KB5019081 (2022-11) for my Windows Servers 2022.

  • HPE SimpliVity HCI.
  • 1 x Windows Server 2022 with WSUS.
  • ~10 x Windows Servers 2022 are fresh install (< 6 months).
  • Cumulative servers updates from WSUS don't work.
  • Cumulative .NET framework updates from WSUS are OK.
  • Office updates from WSUS are OK.
  • Windows Defender updates from WSUS are OK.
  • Security Update Microsoft server operating system are OK (last 2022-08).
  • All my Windows Servers 2022 servers run fine except for installing these Cumulative Updates Server Operating System.

I checked logs.

Server side CBS.log

2022-11-24 11:40:50, Error CSI 0000040d (F) STATUS_SXS_ASSEMBLY_MISSING #2296805# from CCSDirectTransaction::OperateEnding at index 0 of 1 operations, disposition 2[gle=0xd015000c]
2022-11-24 11:40:50, Error CSI 0000040e (F) HRESULT_FROM_WIN32(ERROR_SXS_ASSEMBLY_MISSING) #2296671# from Windows::ServicingAPI::CCSITransaction::ICSITransaction_PinDeployment(Flags = 0, a = Microsoft-Windows-Slb-Mux-Deployment, version 10.0.20348.1, arch amd64, nonSxS, pkt {l:8 b:31bf3856ad364e35}, cb = (null), s = (null), rid = 'Microsoft-Windows-Slb-Mux-Package~31bf3856ad364e35~amd64~~10.0.20348.1.270bcb39b42d1ee0b13e2bdf1d3231e1', rah = (null), manpath = (null), catpath = (null), ed = 0, disp = 0)[gle=0x80073701]
2022-11-24 11:40:50, Info CBS Failed to pin deployment while resolving Update: Microsoft-Windows-Slb-Mux-Package~31bf3856ad364e35~amd64~~10.0.20348.1.270bcb39b42d1ee0b13e2bdf1d3231e1 from file: (null) [HRESULT = 0x80073701 - ERROR_SXS_ASSEMBLY_MISSING]
2022-11-24 11:40:50, Info CBS Failed to bulk stage deployment manifest and pin deployment for package:Microsoft-Windows-msmq-runtime-Opt-WOW64-Package~31bf3856ad364e35~amd64~~10.0.20348.1 [HRESULT = 0x80073701 - ERROR_SXS_ASSEMBLY_MISSING]

WSUS side

Échec de l’installation : Windows n’a pas pu installer la mise à jour suivante en précisant l’erreur 0x8024200b : 2022-11 Mise à jour cumulative pour Microsoft server operating system version 21H2 de x64 avec systèmes basés dessus (KB5019081)

I tried :

  • Update manually with DISM.
  • Clean Software Distribution
  • SFC scan
  • DISM Scanhealth / Restorehealth

Microsoft-Windows-Slb-Mux-Package is related to "Software Load Balancer (SLB) for SDN".
Azure Stack HCI.

Is it a problem related with my HPE SimpliVity HCI ?

Another Microsoft employee @ariaupdated reached out and said it was an update for the Azure Stack HCI, which is updated once a year and applies to virtual machines in the Azure Cloud. This update is not available for on-premises servers. I pointed out that this was confusing – and she now wants to have this described more clearly by the people responsible …

No idea what's going on

  • I have this new category in WSUS "Microsoft Server Operating System-22H2". Beginning of my problems ?
  • Azure Stack HCI SLB ?
  • STATUS_SXS_ASSEMBLY_MISSING "Microsoft-Windows-Slb-Mux-Package"

I just want to apply Windows Cumulative Updates Server Operating System 21H2 for my Windows Servers 2022 21H2.

Thanks for your help.


Windows Server
Windows Server
A family of Microsoft server operating systems that support enterprise-level management, data storage, applications, and communications.
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