The remote host seems to be running RobotFTP. RobotFTP server has been reported prone to a denial of service vulnerability. The issue presents itself when certain commands are sent to the service, before authentication is negotiated. The following versions of RobotFTP are vulnerable: RobotFTP RobotFTP Server 1.0 RobotFTP RobotFTP Server 2.0 Beta 1 RobotFTP RobotFTP Server 2.0

Use a different FTP server