ftpWriter获取文件列表时发生I/O异常,请确认与ftp服务器的连接正常,拥有目录ls权限

使用datax的ftpWriter时候，报错，报错信息为：获取path:[/mnt/ceph_ext/dingyao] 下文件列表时发生I/O异常,请确认与ftp服务器的连接正常,拥有目录ls权限。但是我已经将该路径文件夹的权限改成777，但还是报此错误，求助

Start by reproducing the ftpWriter failure for /mnt/ceph_ext/dingyao and checking the FTP server connection and directory listing permissions described in the report. Compare the configured path and server access with the reported I/O error; done means identifying the cause or the required FTP configuration and documenting a verified resolution.

Written by the indexing model from the issue text.