Dear,
i have 1.5.1 and since 1.4 i am getting continuous same issue of having following message when i try to use auto update of "core" or "plugins" from admin page.
""FTP Invalid attributes! Provided the user does not have permissions to overwrite files.""
#my ftp credentials work properly with ftp client
#asked to my hosting provider for the same issue they said there is issue with oxwall script and not their
#ftp account which i am using have full permissions
{i strongly believe that oxwall script have the bug, because it needs the same ftp credentials-default username and password of ftp which were previously used during the installation of the script}