Win11 24H2 will deploy new measures: 0xc000a000 error occurs when accessing NAS devices through SMB

0xc000a000 Error: Security measures when mapping NAS devices in Windows 11 PHP editor Xinyi learned that Microsoft has adopted new security measures in the Windows 11 24H2 preview version to improve security. However, these measures may cause errors such as 0xc000a000 when the disk is mapped to a third-party network attached storage (NAS) device. To resolve this issue, continue reading below for detailed instructions on what causes this error, potential solutions, and how to avoid this issue.

Microsoft is forcing the use of SMB signatures, disabling guest fallback and other measures in the Windows 11 24H2 update. If third-party devices do not support signatures, we have attached the possible errors as follows :

• 0xc000a000
• -1073700864
• STATUS_INVALID_SIGNATURE(Invalid signature status)
• Encrypted signature is invalid

If A third party requires guest access, and an error may occur:

• You cannot access the shared folder because your organization's security policy prohibits unauthenticated guest access. These policies help protect your computer from unsecured or malicious devices on your network
• 0x80070035
• 0x800704f8
• Network path not found
• System error 3227320323 occurred

Microsoft recommends that users perform these steps in a safe order:

• Refer to the NAS vendor's instructions to enable SMB signing in the device management software (if supported ).
• Similar to step 1, see the NAS vendor's instructions for disabling guest access in the management software.
• Set up username and password authentication on the NAS to ensure secure access.
• If you are unable to enable signing, disable guest access, or use username and password, consider upgrading the NAS firmware to a compatible version.
• If upgrading the firmware does not resolve the issue, you may need to replace your NAS with a model that supports the required security features.

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