Erm.
I really doubt that a firewall is causing your problems with large data transfers. There are firewalled sites that transfer gigabytes of data each day and they never have a problem with it.
Hell, I have a firewall here, and I just transferred 180 MB of data, no problem...
Before you shut down your firewall (which is like going onto a whore-infested street and screaming "I NEED TO GET SCREWED"*) I'd recommend making sure that ports 20 and 21 (ftp-data and ftp) are open, as that seems to be your primary problem. They only have to accept previously-established connections, since you're not planning on doing FTP serving.
If that doesn't do anything try checking out the rest of the firewall configuration. The system may be getting tripped up by overzealous rules that just take too long to process. You may want to consider relaxing some of those.
If THAT doesn't do anything, make sure it REALLY is the firewall. Problems with transfers are more often due to problems with other pieces of the system, both local and remote -- ISP issues, network adapter issues, and so forth.
Only shut the thing off if you REALLY have to -- and only do it for that fraction of time. Every firewall has their own killswitch; go read the manual for your specific firewall system. There really isn't much else that can be said without you telling what firewall you have.
I mean, I could tell you to do
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root@visions root # /etc/init.d/iptables stop
but that wouldn't help you much if you weren't using iptables for firewalll rules...
* True, most firewalls don't provide THAT much protection unless you configure them well and watch over them, but it's better than nothing, so long as you don't get lulled into a false sense of security...
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