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If you experience Windows error when accessing Lumin L2 after updating Windows 11, please follow Point 6 and Point 7 of this article:
techcommunity.microsoft.com
6. Disable the SMB client signing requirement:
a. On the Start Menu search, type gpedit and start the Edit Group Policy app (i.e. Local Group Policy Editor). If you are using Home edition, skip to step 8.
b. In the console tree, select Computer Configuration > Windows Settings > Security Settings> Local Policies > Security Options.
c. Double-click Microsoft network client: Digitally sign communications (always).
d. Select Disabled > OK.
7. Disable the guest fallback protection:
a. On the Start Menu search, type gpedit and start the Edit Group Policy app (i.e. Local Group Policy Editor). If you are using Home edition, skip to step e.
b. In the console tree, select Computer Configuration > Administrative Templates> Network > Lanman Workstation.
c. Double-click Enable insecure guest logons
d. Select Enabled > OK.
Accessing a third-party NAS with SMB in Windows 11 24H2 may fail | Microsoft Community Hub
Changes to SMB security in Windows 11 24H2 release preview may prevent access to third party NAS appliances or other devices.
techcommunity.microsoft.com
6. Disable the SMB client signing requirement:
a. On the Start Menu search, type gpedit and start the Edit Group Policy app (i.e. Local Group Policy Editor). If you are using Home edition, skip to step 8.
b. In the console tree, select Computer Configuration > Windows Settings > Security Settings> Local Policies > Security Options.
c. Double-click Microsoft network client: Digitally sign communications (always).
d. Select Disabled > OK.
7. Disable the guest fallback protection:
a. On the Start Menu search, type gpedit and start the Edit Group Policy app (i.e. Local Group Policy Editor). If you are using Home edition, skip to step e.
b. In the console tree, select Computer Configuration > Administrative Templates> Network > Lanman Workstation.
c. Double-click Enable insecure guest logons
d. Select Enabled > OK.