Do I have to use different ports in ftp for using filezilla and AndFtp?

i connected filezilla using port 8081 but i am not able to use 8082 or 8083
same goes for mobile AndFtp
am i suppose to connect desktop and mobile using different ports?

Not really, at a particular time 2 clients can be connected to the Qbox server. The port 8081 is the listen port for passive mode and the ports 8082, 8083 are max and min ports that are the control ports and the data ports.
Use the port 8081 as the main listen port