Hello , this is not proplem on server or FTP
go try again and download a new winscp
https://www.commentcamarche.net/download/telecharger-251-winscp
go try again of you think pw ftp changed , connect onther for send you new pw and try again
and watch more videos here :
https://www.youtube.com/results?search_query=login+date+contains+non-ascii+characters+and+server+might+
Good lucky !