U should setup at least 10 pasv ports by simultaneous user.
A used port is not closed as soon as the connection is closed; it takes somewhere between 2-10 seconds to be available again.
Hit CTRL-R 5 times in a row, and u'll be out of ports. Same would happen if you browse directories at a decent speed.
Maybe io choose a random port when the pasv ports u specified are all in use.
Try to "netstat -n" very rapidly when u get a higher port. U might see connections on all the other ports from your range.
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