I don’t have a question. MetalHead claimed that the initial Blizzard response was that client-side issues were suspected. I was merely posting to confirm that was, indeed, their initial response.
At the time of the initial “reboot your router / flush your DNS cache” response was issued, there were already a number of threads, each with multiple contributors to it, that were complaining of exactly the same thing, all of which occurred directly after the scheduled maintenance.
Standard root cause analysis is that the most likely cause of a problem is the most recent change and, baring in mind many people had exactly the same problem after a maintenance, that points to the maintenance being the cause, not lots of client PCs all over the world suddenly developing router / DNS cache issues.
Regardless, it’s now three days later and we’re still awaiting more news.