I think more info is needed here.
Please show your devices and services settings (to sort out which ports are used where) and other things that may be relevant. Does your ISP provide you with permanent IP or is it configured by DHCP? Are you using scripts with ioFTPD? In that case.. which ones? What do you mean exactly with "server closes down or something"? Do you get login incorrect (which could be an ident issue) or do you get connection refused? Firewall? Behind router?
Etc. etc.
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