add passive ports

Pure Ftpd

Create a file in /etc/pure-ftpd/conf/PassivePortRange, inside, just write the port range separated with a space.

echo "29799 29899" > /etc/pure-ftpd/conf/PassivePortRange

(for max 50 connected clients)

pure-ftpd uses files in conf dir as parameters. Be carefull setting your ports, they must NOT be used by the kernel.

You must have 2 ports for every client (max 100 clients, you need 200 ports).
If you need more or less than 50 default clients allowed, you must:

echo "50" > /etc/pure-ftpd/conf/MaxClientsNumber

Replace 50 with the number you want to allow...

Remember to restart pureftpd.