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The SMB protocol may be turned off on a file server running Microsoft Windows Server 2012 R2.
In order for Parallels Secure Workspace to connect to a CIFS share on a Microsoft Windows file server, at least the SMB protocol must be enabled on your file server.
At the time of writing, it's recommended to use at least SMB 2.0 or 3.0.
To obtain the current state of the SMB server protocol configuration, run the following cmdlet in PowerShell:
Get-SmbServerConfiguration | Select EnableSMB1Protocol, EnableSMB2Protocol
To enable SMBv1 on the SMB server, run the following cmdlet:
Set-SmbServerConfiguration -EnableSMB1Protocol $true
To enable SMBv2 and SMBv3 on the SMB server, run the following cmdlet:
Set-SmbServerConfiguration -EnableSMB2Protocol $true
More info: How to detect, enable and disable SMBv1, SMBv2, and SMBv3 in Windows (Microsoft.com)
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