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FileZilla FTP server works intermediately

I have installed FileZilla FTP server, v .9.34 beta. For the past two weeks since I installed it, I've been having constant problems, it somes works and sometimes doesn't.  It always works internally, on my LAN, but from the internet, it just sometimes works and sometimes it doesn't.
Any thoughts of what it can be?
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aisaudalite

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I just left the default, which I think is passive.
I have a 50mb always on connection, it's 5mb/sec download. (fiber)
I have a Cisco router and then a firewall behind that.

I have opened up the necessary ports that the filezilla server uses, and created the necessary NAT rules and everything.  The strange thing is that it somestimes works and sometimes it doesn't externally. Internally, it always works, so it leads me to believe it's something with the firwall, perhaps there's a port conflict?
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Yes, I instructed everyone to use filezilla client and most are set to default, but if that didn't work, I just informed them to use the passive setting, and that has been working fine until it decides not to work.
So sometimes it works fine and sometimes it doesn't, the weiredest thing.
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I worked with the support of my firewall co. and they said that the client is coming on different ports, so i changed the port range on the ftp server to a smaller range and now it's working, so I'm curiuos to see how long it's going to work for.  
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Thanks everyone for your help.  On the FTP server, I had a port range of 100, so now when I changed it to a range of only 20, it seems to be working fine now.