Thank for the replies John and Rick,
My Farmbot is running the version of the Farmbot OS that I downloaded from the Farmbot webserver last week. I have also updated the firmware as below:
There is no bespoke Farmware, everything is “off the shelf”
The Farmbot accesses the internet via a wifi connection to a wireless router, this is connected via two daisy chained Ethernet switches and then finally to our NBN gateway router. Could this be an issue? all of the above (other than the external address for the internet connection) are on the same C class subnet.
I read the article that you (Rick) link to, but I don’t think it really applies in my domestic situation. There is some AV software on some of the PCs on the internal network, but I don’t think they have access to the outgoing ports on the NBN router. The firewall on the NBN router, and the Wifi router to which the Farmbot is connected to are both off.