After you change your plan from ADSL2 to NBN, you have to redo your NAT forwarding again with TP-Link vR1600v. It caught me at first as my VNC Server was working all the time even before the day I changed from TPG ADSL2 to TPG NBN HFC. After the NBN technician completed the installation, VNC did not work at first. So I have to go to Advanced\NAT Forwarding\Virtual servers. Disable the original port forwarding rules. Click Add Select the interface that suits your NBN installation: For HFC, it is EWAN_pppoe Set your port forwarding rules again. Restart Modem. It should work now.
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