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Old 20th Jul 02, 08:42 PM
unicorn unicorn is offline
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Join Date: Oct 2001
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Hey IB, If they can connect from the outside they obviously get some contact with your server. So, wait a moment before you reconfig your LAN.

If I get everything right this far you have configured your router to forward all queries from the outside to your server, or rather all queries at port xxxx to your server. Then the client and your server shake hand, get pretty well along - as far as they use port xxxx (the so called control connection). Then when it comes to file listing the data transfer channel is used instead: port yyyy. Most ppl are using some sort of firewall today and those won't accept unexpected traffic. Thus they have to use PASV mode (where the client tells the server to go for port yyyy and send data there). This in turn forces you to config the server to allow PASV mode and maybe also allow a port range. Check this, give it a port range not less than say 1000-5000 or something. Then check that your router allows theese ports, or config it consider your server as a demilitarized zone (DMZ-mode). Ask your friends to connect again and tell them to make sure they config their clients to use PASV mode and then maybe also tick any choice available for "Site uses NAT/IP Masq/Non-routable IP" (or something alike it).

Then please get back here and tell us about it.
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