Enable SMB2 on the Client

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\LanmanWorkstation 
edit DependOnService and add MRxSmb20 
so it should look like: 
Bowser 
MRxSmb10 
MRxSmb20 
NSI

ps. Bowser is NOT a Browser typo! 

THEN 

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\mrxsmb20 

Change Start to 3. (it was 4 = disabled) 

Reboot client

Enable SMB2 on the Client

原文：https://www.cnblogs.com/johnsonshu/p/9876090.html