Localhost applications failing after installing 2025-10 Cumulative Update for Windows 11 Version 24H2 for x64-based Systems (KB5066835) (26100.6899)

Hi @Gionata Aladino Canova ,

According to this thread https://free.blessedness.top/en-us/answers/questions/5585440/kb5066835-update-causing-iis-service-to-not-work

Several users have reported that installing the latest Microsoft Defender update resolves the IIS Express/ASP.NET Web Forms issue without removing KB5066835 or KB5065789. If you haven’t already:

1. Check for updates manually:
   • Go to Settings → Windows Update → Check for updates.
   • Ensure Microsoft Defender Antivirus and Security Intelligence Updates are up to date.
2. After updating, restart your machine and test IIS Express again.

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If you still want to go through with the uninstallation, try this:

Uninstalling KB5062553 fails with error 0x800f0825

This issue typically occurs when Windows has a pending servicing operation or when certain features, such as Windows Sandbox or container-based components, depend on the update being removed.

A few users have reported that disabling Windows Sandbox resolved the problem.

Reference: Reddit thread

Method 1 – Disable Windows Sandbox and related virtualization features

1. Press Win + R, type optionalfeatures.exe, and press Enter.
2. In the Windows Features dialog, uncheck Windows Sandbox.
3. If enabled, also uncheck Virtual Machine Platform and Hyper-V.
4. Select OK, restart the computer, and then try uninstalling KB5062553 again.

Method 2 – Clear update caches and repair the component store

If disabling Sandbox does not help, try the following steps:

1. Stop Windows Update services
   • Press Win + R, type services.msc, and press Enter.
   • Stop these services one by one:
   • Windows Update
   • Background Intelligent Transfer Service (BITS)
   • Cryptographic Services
2. Clear update cache folders Delete all contents inside the following directories:

   
      C:\Windows\SoftwareDistribution 
   
      C:\Windows\System32\Catroot2 
   
   

   Then restart your computer.
3. Repair the component store Open Command Prompt (Admin) and run:

   
      DISM /online /cleanup-image /restorehealth 
   
      sfc /scannow 
   
   

4. Retry the uninstall

   
      wusa /uninstall /kb:5062553 /quiet /norestart 
   
   

   If it still fails, identify and remove the package manually:

   
      dism /online /get-packages | findstr 5062553 
   
      dism /online /remove-package /packagename:Package_for_KB5062553~31bf3856ad364e35~amd64~~10.0.xxxxx.x 
   
   

Additional information

• If KB5062553 has been replaced by a newer cumulative update, Windows may block its removal.
• Always create a System Restore Point before performing system-level maintenance.
• Disabling Sandbox or virtualization features may temporarily affect Docker, WSL, or other virtualized workloads.