C# TCP Client / Server remote connection problem

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Hello,

I get the following exception:
"A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond ...".
State of play:
The client and server are written in C #.
3 remote computers, lets call A (Seven Ultimate), B (Seven Family) & C (XP Pro).
I did the port translation NAT on the PC 3.
A and B have a static IP configured via DHCP (I do not know if it's really useful).
Client / server work perfectly well in local on the 3 PC, so I do not think it is a programming problem.

Server A, Client B does not work (Exception).
Client A, Server B works.
Server A, Client C works.
Client A, Server C does not work (Exception).

I ping A and B without any problem, and (for whatever reason) not C (but I do not have access to this machine, this is a friend's computer), I do not know if this information may be useful.

I can not understand at all why the configurations server A / Client B and Client A / Server C does not work while the opposite yes...

So, if someone has an idea don't hesitate ...
Thank you in advance for your help.

Posted 7-Jun-13 10:13am

asm8086

Updated 7-Jun-13 20:58pm

ridoy

v9

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Comments

Richard C Bishop 7-Jun-13 16:16pm

FYI, this is an English speaking site. Use a translator next time if your English is not sufficient.

Sergey Alexandrovich Kryukov 7-Jun-13 16:30pm

Everything like that is pretty easy to screw up. But how can we see what have you done wrong?
—SA

Farzad Nozarian 7-Jun-13 16:37pm

use static ip (manually config your ip not dhcp) and turn off firewall on all computers and try again!

R.B. 7-Jun-13 20:35pm

Start with one server - just pick A. Can it handle multiple clients (eg, B and C)? Or just a single connection? Show us what code you are using on the server and you'll get more help.

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JeremH · Answer 1 · 2013-06-07T21:42:00

Solution 1

hi,

If you want to be safe check the connection install the wireshark software on each machine and to verify that packets sent/received because the ping is not enough.

good luck

jeremy

Posted 7-Jun-13 21:42pm

JeremH