Hey MacRumors, Yesterday, I've got my internet connection upgraded to fibre. My ISP also replaced my old Linksys router with a newer Fritz WLAN 7390. However, now port forwarding isn't working anymore! I usually have no problems configuring networked stuff, but I can't seem to figure out the problem this time. I've configured a static internal IP - 192.168.178.33 - for my computer: I've also enabled UPnP on the router. I know that it's not the safest option, but it's usually pretty practical. The router does also open the right ports for Transmission when I open the torrent client. Transmission doesn't recognise the opened ports though! Furthermore, I've tried configuring the ports manually with TCP and UDP, but unfortunately that doesn't work either. I think that the problem might be caused by the new internet connection, which has IPv4 and IPv6 enabled. I don't know enough about those "protocols" to figure out a solution on my own. Any ideas?