Did you check if UT is in the exception lists on your firewalls and antivirus programs?

Just start a server from the in-game option, and your friend can connect with the "open ###.###.###.###" command directly. The "#" stands for the IP address. It works nearily the same way as in UT2004.

I tried it but when someone put in "Find Location" IP adress there's black window with "Connecting" and "press ESC to begin" and "Press f10 to cancel" - then when ESC is pressed the game back to main menu.

We can play on someones server, but - you know - it's not the same thing which we expect ;)

If you can't connect to a server directly, then the server is blocked. As Plokite_Wolf said, probably the firewall or anti-virus not letting the client connect to the server. Just allow the connection and it will work. :)

I've tried it, allow for connection in Windows and anti-virus, but no one can join. Is there any difference between standard or dedicated server? Made both of them but nothing works ;/ or maybe im doing something wrong with "allow-to-connection" things?

Generally, the dedicated server go through their official matchmaking service or whatever they call it, enabling the server to appear on every browser regardless of location and protocoll. Connection-wise there is no difference however, if one works the other should too.

Honestly I don't know how to host a server behind a router. You may ask someone to help through TeamSpeak or something. I'm sure you do everything right, just something block the connection.

Hey, still can do nothing. There's a printscreen attached to post, where propably i should write proper numbers. My router is Technicolor tc7200

Maybe someone can guide me? And maybe can you show me your printscreen from WIndows exception list how should it be done? Im very sad and sad in backward ist das, und das ist nicht gut...

https://portforward.com/technicolor/tc7200/