Windows 11 24H2 Update: Fixing Local File Server Access Issues

With the recent release of Windows 11 version 24H2, many users are encountering unexpected issues when trying to access local file servers. If you depend on Network Attached Storage (NAS) or other file servers, you might see errors such as “The cryptographic signature is invalid” or “STATUS_INVALID_SIGNATURE.” This problem primarily results from a security enhancement that requires Server Message Block (SMB) signing on file server communications. Here’s why this happens and solutions to help you regain access safely.

Why the Windows 11 24H2 Update Causes File Server Access Issues

The update enforces SMB signing, which digitally signs each packet in the SMB communication, securing the data flow between clients and servers. However, this change can prevent access to devices without updated firmware or to older NAS systems that don’t support SMB signing. When SMB signing is unsupported, Windows may block access for security reasons.

You can find more details on why SMB signing is critical in network environments through resources such as Microsoft’s overview of SMB signing.

Solution 1: Enable SMB Signing on Your File Server

The most secure solution to resolve Windows 11 24H2 update file server access issues is to enable SMB signing on your NAS or file server if it is supported. Many NAS manufacturers provide guides on enabling this feature, so refer to resources such as Synology’s SMB signing setup guide if you’re using a Synology NAS.

Solution 2: Disable Mandatory SMB Signing in Windows 11

If enabling SMB signing on the server isn’t an option, adjusting the settings in Windows 11 to disable mandatory SMB signing can help restore access. However, be cautious, as this may reduce network security by allowing unsigned SMB communications. Here’s how to do it:

Disabling SMB Signing Using Group Policy Editor

1. Press Win + R, type gpedit.msc, and hit Enter to open the Group Policy Editor.
2. Navigate to Computer Configuration > Windows Settings > Security Settings > Local Policies > Security Options.
3. Double-click Microsoft network client: Digitally sign communication (if server agrees).
4. Set it to Disabled, click Apply, and then OK.
5. Restart your computer.

Disabling SMB Signing Using PowerShell

1. Open PowerShell as an administrator.
2. Run the following command:
   Copy code

   Set-SmbClientConfiguration -RequireSecuritySignature $false

3. Confirm the change when prompted.
4. Restart your computer.

Note: Disabling SMB signing should be a temporary fix. Once your server or NAS supports SMB signing, re-enable it to maintain a secure network environment.

Solution 3: Update Firmware on NAS or File Server

Updating your NAS or file server firmware can often resolve compatibility issues related to SMB signing requirements. Many device manufacturers, such as QNAP, offer firmware updates that support the latest Windows security protocols, enhancing compatibility with updates like Windows 11 24H2.

Alternative Solutions for Windows 11 24H2 File Server Access Issues

If the above solutions don’t resolve the problem, consider these alternatives:

1. Use VPN Connections: For those on a corporate network, a VPN connection may bypass specific SMB signing requirements, depending on your network setup.
2. Replace Outdated NAS Devices: Upgrading to a more recent NAS model with native support for the latest SMB protocols can be a long-term solution. Devices like those from Asustor offer updated security features compatible with Windows 11.

Final Thoughts on Windows 11 24H2 File Server Access Issues

Navigating Windows 11 24H2 update file server access issues can be challenging, especially for users with older NAS or file server systems. By updating your device’s settings or firmware, you can restore access to your servers while preserving network security. For further official guidance, Microsoft’s tech community article on SMB compatibility provides in-depth support on accessing NAS devices affected by this update.

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