Do you have a commercial/business account with your Internet Service Provider? My provider does not look kindly on those trying to "borrow" services they are not paying for.
My advantage is: I have several computers on the internet, most on separate static ips, all on commercial accounts. If I have a problem, I do not hesitate calling my ISP and asking about it.
I have a private account with my ISP. And I had had the same probleme before, when I made a minecraft server on my computer. The problem was port opening and forwarding... it worked half the time =(
But recently, I made an online tchat (server in C, client in PhP), and it works fine with a personnal port... I'll try to use my tchat with the port 5550 tomorrow
That sounds like a good test. Most ISPs don't care if you have one device off-port sending data to your residential ip. They just don't want you hosting a public website without fair compensation.
OMG ! I found the problem this morning... I believe I'm gonna commit the suicide...
My ISP port forwarding works well... but not if I'm connecting FROM my ISP ! I sent the client apps to a friend, and it works perfectly... Two weeks ago I got the second version of my isp box. The first version worked well, but I read on the internet that there are many problems with the second...
I thank you so much for your help 
ps : my tchat doesn't work anymore with my new ips box, and it have been worked with the same code... just because they fucked the port forwarding ! =(
my tchat doesn't work anymore with my new ips box, and it have been worked with the same code... just because they fucked the port forwarding
few ways might help;-
plan A.
change TCP port number, if TCP port 22 is not used, then use it, most ISP use it to manage itself equipment, some time might be 2222. Use UDP port number above 10000.
plan B.
load VPN client app into your router. setup VPN.
plan C.
SSH tunneling, load SSH tunneling into router.
Thanks sonnyyu, I'll try with port 22 / 2222 But I can't use a VPN or SSH tunnel connection with my actual IPS.
my tchat doesn't work anymore with my new ips box, and it have been worked with the same code... just because they fucked the port forwarding
But I meant, it doesn't work anymore with the same configuration as before. That's it, if I want to use my chat on my own computer, I can't unless using a local connection just for users in my network. I only have to edit my code to work with the new port forwarding configuration of my ISP (which is a big sh** XD).
I believe I'm gonna commit the suicide
Don't do that, there are 1,354,040,000 persons in same boat with you.
Great Firewall of China, It block almost every thing, even VPN....
China Population: 1,354,040,000 December 31, 2012
Great 
But my problem is solved, I've no more reason to commit the suicide ^^ now I'm gonna kill my ISP instead 