Thx Panzertard,
my settings are ok so far i believe.
I even did open port 10307 as u mentioned. Portchecker says ports are open. When i make a server my friend cant see it. He can see other servers.
When i disconnect and go to client, i can see my external ip adres is shown in the serverlist. Even when i click refresh. My friend did see that also, when he tried to connect that (with or without the shown port) his connection fails. Of course i had my server running then :).
Now i made a static ip, but things stay the same.
I really cant figured out what is wrong. What i believe is strange;
when my external ip adress is shown in the server list there is, every time i make a server, a new portnumber shown. (example :55603)
Anyway, thx for the help so far.