Windows Server 2012 introduced a new version of the Server Message Block (SMB) protocol. SMB version 3 includes new features such as encryption. If your environment does not have any Windows XP or earlier clients, an option is available to disable SMB version 1 to improve security. The PowerShell cmdlet Get-SmbServerConfiguration will offer information on the current status of SMB version 1 and 2.
To disable SMB version 1, use the PowerShell command of Set-SmbServerConfiguration –EnableSMB1Protocol $false