Ugh network issues. Took me all morning to download the Xcode beta. Had to restart every 10-30 seconds. Would start at 5 MB/s then trickle of and die. :\
Network trace showed a ton of dup acks and then at the end the remote host hangs up with a FIN.
I FIXED IT! Don't use the surge protector on your UPS. Just don't. :facepalm: Totally messed up everything. Went back to ONT->Gateway with no UPS in the middle, and all's more than well.
@prometheus I've got a CyberPower CP1500AVRLCD Intelligent LCD UPS 1500VA 900W AVR Mini-Tower [amzn.to]. It will do shutdown signal over USB. I've got it set up to do that for my NAS. (Bought it because I was getting a NAS, TBH.)
Go to the App Directory to explore the network more!