VPN will not enable; message Service Port has to be less than or equal to 65534
My R8000 router will not enable VPN. When the Apply button is clicked, a popup appears with message
"The Service Port has to be less than or equal to 65534."
Interestingly, it doesn't matter whether the Enable VPN Service box is checked or not, which is possibly also a bug. It is not obvious what Service Port is being referenced, and I cannot see where a Service Port value is set. The message does not appear anywhere I can find. TUN Mode Service Port is 12973 and TAP Mode Service Port is 12974 (both defaults).
It is not possible to download the config package until the VPN is enabled, which confirms that the VPN is not enabling. Port forwarding, external access, and a heap of other obscure functions all worked first go.
Firmware is latest version V188.8.131.52_10.1.54
I would like to use the VPN facility - so what do I do?