Thanks for the suggestions.
I have read the wiki (first to admit that doesn't equate to always understanding).
Yes I can connect using my wireless LAN.
It is only from outside my LAN that I have trouble.
So I assumed it was a port forwarding issue, but I have forwarded the port to the correct machine, and I have done the test under MC and it does not report an issue.
I tried a different port this morning (22199) and reset the access key and retested. I also put exceptions in Windows Firewall, still no luck. Then disabled Windows Firewall and still no luck. [I could connect within the LAN as before, but not externally]
OK, as typing this I tried pinging machine from here and with other web pages that do the same, and no luck. But the same sites say the port 22199 on the same ip address is open. So I am assuming it must be reachable behind my router but pinging is denied? I guess I need to check more things on my router.
Is there anything other than the port that needs to be open for Gizmo to work? Must it also be pingable?
Thanks
Craig