Many years ago, I flew HKG-PVG-NRT. When I was in the lounge at Shanghai I opened up my laptop to relax and peruse HN. I typed in the URL and ... nothing. "Stupid Linux WiFi, sigh," I thought to myself. After a bit more investigation, I realized that it was
only HN that didn't work. "Oh yeah..." I realized.
Fortunately, HN was also blocked where I worked at the time, so I already had a proxy set up. That worked fine. How subversive of me!