Thanks for sticking with me ww.
There are two port numbers because one is for my Azureus (which I've never had Firewall or connectivity problems with from Day One).
I have previously had your suggested port numbers in there for a couple of days (50157) - but changed them to see if this would help.
Thanks for the modem port forwarding link. I'll check that out. (Your link doesn't connect, so I'll Google it instead).