This question was also answered in BitNami Community Forum. The issue was related to the smbclient command, not Alfresco itself, that is why you didn't find anything related in the Alfresco log files. The following smbclient command should be used:
$ smbclient \\\\127.0.0.1\\Alfresco -U user -p 1139
Enter user's password:
Domain=[WORKGROUP] OS=[Java] Server=[Alfresco CIFS Server 6.0.0]
smb: \\>