FreeNAS 11.1-U6 CIFS Problems
If like me you upgraded FreeNAS to 11.1-U6, then you’ve likely run into issues due to SMB1 being disabled. See below link for the particulars: FreeNAS 11.1-U6 Release Notes Changes in SMB for 11.1U5 to 11.1U6? Mounting cifs: “Operation not supported”