I see that a user in October 2020 reported a 502 Bad Gateway, but his problem was resolved, and I don’t know if the problem my team is having yesterday and today is the same or different problem.
All computers and phones in our home are unable to get to pressbooks dot com and we get 502 Bad Gateway response, but if we use cellular connection on our phones, we can get to the site.
We had the same problem several weeks ago right after I added a new user to our team, which I assume is coincidence rather than causal. It resolved on its own back then after a couple of days.
This time has a new wrinkle. I added my sister as a new user. She lives 600 miles away, so she has to be on a different Internet pathway than we are. Immediately after adding her as a new user, she couldn’t get to pressbooks dot com through her home wireless but could get there if she used her phone with WiFi turned off.
I tried to use fiddler to dig into what happens when we try to get to pressbooks.com, but it shows no intermediate problems, just the 502. When I look up 502 on MDN, it points the finger at the pressbooks site.
If anyone on this forum knows anything about my problem, I would be most appreciative.