Serv-U FTP Server Updated at December 1, 2014 By SolarWinds (prev. RhinoSoft or CatSoft) Serv-U FTP server includes web, mobile device, SFTP and FTPS file transfer for Windows or Linux. Now also includes “ad hoc” secure file sharing. Used by 9 of Fortune 10. Each server supports 100’s of GBs per day and 1000’s of users.