Some years ago, I had a miserable couple of days when an internal DNS server quit working. Eventually I traced it to a corrupted cache file. Once that was delet

Some years ago, I had a miserable couple of days when an internal DNS server quit working. Eventually I traced it to a corrupted cache file. Once that was deleted, life returned to normal. Though unpleasant, it was an enlightening experience. I had never imagined how much of the internet ran on Amazon by then (2010?).