This will mainly affect older NAS devices and other network devices that aren’t configured for SMB signing. Newer NAS hardware should already have that working and configured, but there’s a chance some device manufacturers didn’t bother because it wasn’t strictly required (until now).

Microsoft recommends setting up SMB signing on your NAS, setting up a username and password, and turning off guest sign in. If none of those options are available, you can try checking for software updates on the NAS—the manufacturer might have implemented those features after the device was shipped.

For NAS devices that don’t support the required security features and don’t have any updates, there will be a workaround available in the Edit Group Policy app. However, Microsoft warns that that the steps “will make your Windows device and your data much less safe.”

Windows 24H2 is expected to be released in a few months, but it might take longer than that to roll out to all Windows 11 PCs automatically.

Source: Microsoft Blog