C:>net use u: \192.168.12.12transfer /user:mike pass
System error 1272 has occurred.

You can't access this shared folder because your organization's security policies
 block unauthenticated guest access.
 These policies help protect your PC from unsafe or malicious devices on the network.

[transfer]
   comment = file transfer share
   path = /usr/local/transfer
   writable = yes
   browsable = yes
   valid users = mike
   create mask = 0777
   directory mask = 0777