We have a custom FTP Service , and custom FTP adapter . Customization is just to find a duplicate file and for giving specific dynamic file spec pattern.
While running and polling for files, we are getting this error. Could you please help ? What's the issue and how to resolve it ?

ERROR <Ens>ErrFTPListFailed: FTP: Failed List for <FileName> (msg='Cache error in 'readResponse': <READ>zreadResponse+4^%Net.FtpSession.1',code=426)