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I didn't think I had it open to anything outside my LAN. I set this up a couple of years ago when I first got the printer. I had problems using USB and the SD card process was cumbersome, so I had heard about OctiPrint. I bought a Raspberry Pi 3 B+ and downloaded OctoPrint, then followed their directions for flashing it and getting the Raspberry Pi up and running. I certainly didn't go outside of those directions to open anything additional or make any undirected configuration changes.

Guess I need to go back thru it now that I have a couple years experience with it to make sure it's isolated.