I am having this same problem using the latest versions of RW6 and Stacks3. RW opens an ftp session and leaves it open and created a new one with each publish. If I publish several times I have to log into my Host Cpanel and disconnect all the idle sessions RW has left behind, I have been using RW for years and this has cropped up recently. Have I missed something in the settings when upgrading to RW6?