QTcpSocket only works local

[squidge]

HTTP/FTP/SSH are outbound only. They don't need to be forwarded. Your PC requests the connection. P2P can detect your PC is unreachable and since you connect to lots of other people, rather than people connecting to you, it can inform your PC via a proxy to connect to them. Same with Messenger, which connects to a central hub to relay messages.

I don't know your router, and so I've no idea how it works. Did you buy it or did it come free from your ISP? The former should be easy to edit the configuration. The later is normally more difficult as ISPs like to lock these things down to stop people from messing with it.

Either way, you may want to lookup the UPnP architecture. Maybe your router has it enabled. If it is, your P2P/Messenger client is most likely already using it to forward ports to itself.

[BrainStorm]

HTTP/FTP/SSH are outbound only. They don't need to be forwarded. Your PC requests the connection. P2P can detect your PC is unreachable and since you connect to lots of other people, rather than people connecting to you, it can inform your PC via a proxy to connect to them. Same with Messenger, which connects to a central hub to relay messages.

I don't know your router, and so I've no idea how it works. Did you buy it or did it come free from your ISP? The former should be easy to edit the configuration. The later is normally more difficult as ISPs like to lock these things down to stop people from messing with it.

Either way, you may want to lookup the UPnP architecture. Maybe your router has it enabled. If it is, your P2P/Messenger client is most likely already using it to forward ports to itself.

My modem is a SmartAX MT880a, my ISP provided it but i have full access to it, but, i'm not going to mess with it so, i have to learn how to (in code) use upnp to forward ports and make my apps works fine, can you point me a start? thanks anyway, you're being a light.

update:
I was looking aroung my modem configuration and, upnp is not active, but firewall is. I've gone further, I've runned remote nmap agains me and the results looks weird, like i'm not even up (no ping). I'm afraid of turning off my modem's firewall, what a sad problem

[squidge]

Yes, your modem has your external IP address, so no one even knows your PC exists as the modem will typically block all pings. This is a great advantage - any attacks get aimed at your modem rather than your PC so far less risk of your PC being hacked, as people can't see it.

No need to turn off the firewall, just enable the upnp and leave it as that. Make sure you use Windows update as the original version of UPNP on Windows had some vulnerabilities.

How to use UPNP in Qt is really beyond the scope of this forum, but there is a lot of information out there and a good number of open source apps which have UPNP included.

[utkozanenje]

sorry for bumping this thread, but I have same problem, my application need to create server where other can connect, but it do it local.. when i give to my friend, he has different internet provider and he can create server

i read this thread, but didn't found the answer what should i do (probably u said it, but i'm not god with network configuration, and couldn't understand..)

i have huawei 520 echolife router, and have all admin priviliges, so what should i enable/disable

[squidge]

That depends on what you have setup, you may need to punch a hole in the firewall and you may need to add a route to your NAT configuration.

We can't tell you exactly what to do because we don't know your exact network configuration.