Accessing your link, the GPEDITs did it for me. The SMB connections to my 2 NAS weren't connecting. Step 7 did it.
- Disable the guest fallback protection:
a. On the Start Menu search, type gpeditand 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.
Rebooted all good.