ftp behind linux firewall doesn't work

Port 21 is only used for incoming requests to establish connections, you also
need to allow connections to unprivileged ports from 1024 to 65535 for data
channel transfers:

1.) Incoming requests:
INPUT   source = unprivileged; destination = 21
OUTPUT  source = 21; destination = unprivileged

2.) Normal port mode for data channel responses
INPUT   source = unprivileged; destination = 20; state = established,related
OUTPUT  source = 20; destination = unprivileged

3.) Passive mode data channel responses
INPUT   source = unprivileged; destination = unprivileged
OUTPUT  source = unprivileged; destination = unprivileged; state =
established,related

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