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  • SMBv1 has serious security vulnerabilities. It was the main attack vector of the "original" WannaCry ransomware. If the remote server does not even support SMBv2 (vers=2.0 for mount -t cifs), it's probably an old Windows Server 2003 system or some NAS system with an out-of-date SMB implementation. Commented Oct 2, 2019 at 12:43
  • Thanks - a very useful observation. I will try and use v2 and warn them they shouldn't be supporting 1. Commented Oct 2, 2019 at 15:34