no Connecten, Keine Verbindung

Thanks for the log! According to it, there is an incoming connection, so it seems the server is basically reachable, but apparently the client cannot fully establish a connection. Are you sure that all ports are forwarded? You've set the server port to 5300, that means you have to forward port 5300, 5301, 5302, 5303 and 5304 TCP and UDP.

You can use this tool to find out if the port is actually open, just run the server, then check ports 5300-5304: https://www.yougetsignal.com/tools/open-ports/

Quote from SgtNiGhTeR

If I set the default port I don't need to forward any ports right?

You still have to forward ports. If you set no port, the server uses the default port 4255, which means you have to forward ports 4255-4259 (if you want it to show up in the server list, you also have to forward port 4254 [or port 5299 if you use Port 5300]). Port forwarding is always necessary if your behind a router.

This topic contains more information about the dedicated server setup: Dedicated Server Setup

Quote from SgtNiGhTeR

Also ich habe jetzt alle ports Freigeben

Are the ports open according to https://www.yougetsignal.com/tools/open-ports/ ? To check that, please run the dedicated server, then go to the website (while the server is still running) and check ports 4254-4259