Amazing! Dave’s suggestion of changing my computer’s MTU setting worked!

I had been unable to visit one particular site for a week or two (”Connection reset by peer”), but the problem existed only on one computer; the laptop could connect just fine. Clearing temp files and cookies didn’t work. Changing browser didn’t help. Obtaining a new IP didn’t work, both from my local network and from my ISP. Using tor did work, and so did ping. All other sites were functional.

Dave (I think it was Dave!) mentioned that changing the MTU size had fixed a similar problem for him, so I looked it up, found this handy explanation, and fiddled with ifconfig. It was set to 1492, so I changed it to 1500, and it worked. I’m astonished! What had suddenly changed that required me to do this?