SMB1 is disabled by default for security. If legacy clients are unable to connect to the share, open Shell, type sysctl freenas.services.smb.config.server_min_protocol=NT1, then restart the SMB service. If legacy clients can then connect to the share, the change can be made permanent by going to Tunables, creating a tunable with a Variable offreenas.services.smb.config.server_min_protocol, a Value of NT1, and a Type of Sysctl.