I have a problem with vsftpd on Debian: I can upload files if the chmod of all folders is 777, but with chmod 755.
local_umask=022 anon_umask=0755 file_open_mode=0755
migrated from stackoverflow.com Dec 4 '11 at 8:21
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Sounds like the user you're logging in as has no ownership rights of the folder you're accessing.
FWIW 777 isn't neccessary as you don't need execute (just read/write)
You could possibly put the ftp user in the same group as the owner then