When you say connected via a hub, I presume you mean USB hub right?
Ethernet would be faster & more reliable.

I'd suggest you try the port forwarding. But before you do that, go to LW's menu bar, Tools>Options>Advanced>Firewalls & change the listening port to 64049. Then restart LW. See if that makes a difference. If not, then try port forwarding from the link I gave above. Choose the one that looks the most similar to yours.

I've come across a couple of other users from S. Africa who had problems with their ISP secretly causing problems. I hope this is not the case for you.