simpleServer ftp android

hello thanks for your work, i loaded from github, i replaced the FtpServer.cpp file. the application connects well, starts loading, then nothing, a message is displayed real time out. on the app the information I have are: site free -211 end -PASV. j on the console the last line is: Command is: PASV Connection management set to passive Listening at xxx.xxx.xxx.xxx:50009 thank you for your help