Tekkit server friend cant connect

[Emudio]

Hi all, I am having some problems with the tekkit server I want to host. I did portforward everything and its not just with tekkit, the problem occurs to terraria too, I dont know if I did something wrong or that the problem is with my friends pc, but could someone help please?

Thanks in advance!

[Fantastic Chimni]

Did you set up a static ip that he is trying to connect to? If he is trying to connect to your internal ip (the 192.168.x.x) address it will not work as that is your local network, not your external ip. You port forwarded everything to the static ip you have set up then sent him your external ip address? 

If yes to all of that, You may have NAT setting set to Strict or Moderate in your router. Either of these things are common errors with not being able to connect.

If you are still lost on what to do, you could try setting up hamachi with your friend and using that to mimic a LAN network and use that IP to connect.

[Emudio]

The thing is, it doesn't work with hamachi too! I do have a static ip (i followed some tutorial on that) and i set everything up, i gave him my external ip. I have a TP-link TL-WR841N Router and I don't know where to find the NAT function. Any help?