I followed this KB to disable SMBv1 server and client with Group Policy. After that, my DC seems down as I got many error that no AC server is founded in my domain. I then found the workstation service cannot be started, it said "Windows could not start the Worksation service on Local Computer. Error 2: The system cannot find the file specified".
The registry I changed are here:
However, even I deleted these new created registry keys, I still cannot get my DC back. This is the only DC in my environment. Help!!