Can't host server with real IP

[RealViking]

It probably means you need to forward your ports correctly, 28763 and 28764 by default.

I've already done that and my server used to work perfectly, it still does but i cannot use it with my real IP wich is a problem because i have to pay for my new IP and it slows down my net speed.. It's like my server only works if I use this fake IP but its now even static, it changes a bit every time i use it