I recently ran into an issue where I could not map network drives to our SAN. Mapping between machines worked just fine.

When using UNC paths I recieved "an extended error has occured".

When using NET USE I recieved "system error 2148073478 has occured".


If you run Powershell from your Win 8 machine and run the following command: 

Set-SmbClientConfiguration -RequireSecuritySignature $true

When prompted enter "Y". After a reboot all of my usual drives are now mapped.