We are closed today in observance of Yom Kippur. We will open again in. . .
I just had a customer call because they could not connect to file share hosted on a Windows 7 Pro workstation from a Windows 10 Pro workstation.
They installed KB4480970 about 6 days ago. This seems to be the cause of our issues.
Big thanks to the people over at Windows Report for breaking this story for us!