How to send a file without getting Connection Refused??

Hello everyone!
I'm developing a FTP (Client and Server) program as a project and I have 2 main problems:
1. The program can't connect to computers with router (Connection Refused error)
2. If a computer with router connects to me, the program will not transfer the file (Connection Refused error again). but if it does, my friend's internet is suddenly disconnect after one transfer
what should i do?!? : //
everything is working well on one computer, but when i'm trying to work on 2 computers its screwed
***FOR EVERY TRANSFER I OPEN A DIFFERENT SOCKET AND CLOSE IT (AND ALL THE OTHER STREAMS) IN CASE OF EXCEPTION OR COMPLETION
Thanks!!

cotton.m wrote:
Oron wrote:
lol
sorry..just want you to notice
so how the other ftp programs transfer files? : //
i have a test up against 2 testers and my program will not transfer files between 2 computers : ///Are these two computers on the same network? Aka behind the same router? If so then there is another problem, which is either a bug in your program and/or a firewall on one or both of the computers.
How does FTP work normally? Well in most cases you are talking to a server that is on the internet. This server has been configured to be behind or on a network where the routers are not blocking requests to connect to FTP ports (among other services). So nothing different other than it is configured correctly.
I do suspect your program may have some bugs as well. For example when you talk about it dropping the connection after one transfer. That doesn't sound too great.when i checked the program...no
in the test...yes
so the server has no blocking ports, but what about a client with a router?..how do the programs pass the client blocking?
when i checked the program with a friend (i have a modem and i was the server) all the data was perfectly transfered (moving among folders, deleting files, creation of folders-->all these actions on the server..sending codes, strings and stuff), but when i tried to transfer a file it did connection refused :S
i can bring a link to the file that do the transfer and if you have patience to read

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