You can resume any stopped downloading. If a file to be transferred already exists in the local directory and it is smaller than the one that is about to be downloaded, you can resume the downloading. When resume downloading a folder, Xftp checks the size of each file within the folder and selectively downloads the required files.
The server encountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator at webmaster@systemmanager.forsenergy.ru to inform them of the time this error occurred, and the actions you performed just before this error.
More information about this error may be available in the server error log.
Additionally, a 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request.