Macos – Sync two home directories between macbook dropbox and hackintosh

First, make sure you own your home folder (note: I'm assuming you're running this from your own user account, and that you're an admin):

sudo chown -R $USER:staff ~

Then, give yourself proper access and nobody else any access (we'll make some exceptions later). Note that this is 2 commands to make sure that execute access gets added to the directories, but not plain files:

chmod -R 600 ~
chmod -R u+rwX ~

Now, grant read access to others for the directories they're supposed to have access to. If you don't have a sites folder, you can leave that off the second command:

chmod og+rX ~
chmod -R og+rX ~/Public ~/Sites

Apple likes to have access control entries to keep you from messing with "important" parts of your home folder. Again, if you don't have Sites you can leave that off (do not leave out Library; it's invisible, but it's there):

chmod +a "group:everyone deny delete" ~ ~/Desktop ~/Documents ~/Downloads ~/Library ~/Movies ~/Music ~/Pictures ~/Public ~/Sites

Finally, fix your Drop Box:

chmod og=wX ~/Public/Drop\ Box
chmod +a "user:$USER allow list,add_file,search,delete,add_subdirectory,delete_child,readattr,writeattr,readextattr,writeextattr,readsecurity,writesecurity,chown,file_inherit,directory_inherit" ~/Public/Drop\ Box

Note that this procedure will not properly "fix" the permissions on files inside your various folders, but that doesn't really matter since it gives you full access to them and nobody else can get into the folders anyway...

Sounds like your users aren't on the service access control list for the FTP service. Check in the Users section of Server.app by selecting the user, then choosing "Edit Access to Services" under from the action (gear icon) pop-up menu.