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=== No dialect specified on mount ===When attempting to 'mount -a' against your /etc/fstab you see a system generated error mount error(22): Invalid argument Refer to the mount.cifs(8) manual page (e.g. man mount.cifs)Further analysis by looking at kern.log tail -f /var/log/kern.logReveals the following error message kernel: [86079.045389] No dialect specified on mount. Default has changed to a more secure dialect, SMB2.1 or later (e.g. SMB3), from CIFS (SMB1). To use the less secure SMB1 dialect to access old servers which do not support SMB3 (or SMB2.1) specify vers=1.0 on mount. kernel: [86079.065167] CIFS VFS: Unable to select appropriate authentication method! kernel: [86079.065176] CIFS VFS: Send error in SessSetup = -22 kernel: [86079.065219] CIFS VFS: cifs_mount failed w/return code = -22