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The problem is because your folder is owned by root, instead of ftpuser.
root
ftpuser
To fix it run:
sudo chown -R ftpuser:nogroup /var/www/ftuuserfolderreboot
Ubuntu中建立ftp 503错误解决办法
原文地址：http://www.cnblogs.com/haoliansheng/p/5014724.html
