Everytime when I send a buffer 1000 bytes long to the freefloat ftp server in the MKD command , it crashes. I am trying to develop an exploit for it so I attached the immunity debugger to the freefloat ftp server process but when I send the buffer to the ftp server and I press play in the immunity debugger , the register window get in blank , I have been so long trying to fix this, please help.