You find a missing mapped drive and / or you attempt to map to a drive and you receive an error stating:  "You can't connect to the file share because it's not secure.  This share requires the obsolete SMB1 protocol, which is unsafe and could expose your system to attack."

The error:





First, let's discuss the fix:






HKLM\SYSTEM\CurrentControlSet\services\LanmanServer\Parameters

Smb1 set to false (0)
Smb2 set to true (1)

If either are missing, add them as you see above.  In my case, a reboot was not required, it just solved the problem.

There are a couple of interesting facts about this situation --

1.  SMB1 has already been disabled so I'm not exactly sure why it's been revived.
2.  I believe this registry entry should have both SMB1 and SMB2 but only SMB2 was present on this server and it was set to false.  I had to add SMB1 and set to false.