If you're having problems with iptables blocking FTP you can usually work around it by making sure that you have passive mode enabled in your FTP client. If you already have, then you probably have a bug in iptables and connection tracking in your kernel and will have to open a hole in the firewall for passive FTP connections. To do that in csf, have a look in the configuration file and search for PASV for instructions.
I know this is an old topic, I had similar issues and ran into this topic on the first link of google, if I did so others will. Thought to update it with the solution.
You can open the ports 49152:65534 in firewall configuration.
Based on this documentation: How to add the passive port range to CSF Firewall
You can open the ports 49152:65534 in firewall configuration.
Based on this documentation: How to add the passive port range to CSF Firewall
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