QNetworkAccessManager: get request with 'ftp' scheme is using incorrect path

About QNetworkAccessManager ftp...

Anonymous access to vsftp work fine.
But, non-anonymous access to vsftp does not work.
( error msg is: "Error while downloading Could not get file size." )

Temporary workaround is the following.
http://stackoverflow.com/questions/27009650/error-when-i-try-to-get-an-file-on-ftp-by-qt