If you wish to be able to access and write to this path via your FTP Port, In IS Server UI > Security > Ports > Edit Access Mode, you can set the Access Mode to “Allow by Default” or you can set it to “Deny by Default” and add the services that should be permitted to be executed/run from this port.
I have done this before, Access Mode is set as “Allow by default” at least for testing purposes. What about the directory ? Is there any reserved directory for ftp within WM IS 4.6 ? Anyway thank you for giving me that hint.