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Fix Access to Shared Folders after Windows 11 24H2 Update

Follow these steps on the Windows 11 computer having trouble access the shares.
DO NOT FOLLOW THESE STEPS ON THE SERVER COMPUTER

  1. Open Group Policy Editor (gpedit.exe)
  2. Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> Security Options
  3. Set Microsoft Network Client: Digitally sign communications (always) to DISABLED
  4. Set Microsoft Network Client: Digitally sign communications (if server agrees) to DISABLED
  5. Computer Configuration -> Administrative Templates -> Network -> Lanman Workstation
  6. Set Enable Insecure Guest Logons to ENABLED
  7. Try to access the shared folders again.