QTcpSocket only works local

[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.