Hi Ian,
I had the Opensprinkler in regular running mode. As I said, my desktop is connected directly into the router via Ethernet cable. I can log into the Opensprinkler, set up schedules, trigger manual run times, etc, as I sit at my desk and look out over the backyard. But trying to log into the updater didn’t work – I could get there but then it failed.
Getting out a laptop and connecting via wifi to the same interface worked, quickly and easily.