Very weird situation this evening, I'm hoping maybe someone can give me a clue of what's up.
I use a /ww2/ subdomain for my sandbox. Last night (about 6 hours ago), the subdomain stopped responding, giving me an ERR_NAME_NOT_RESOLVED error. The main domain worked just fine, it was just the subdomain giving this error.
After some poking and prodding, I finally realized that I could take my phone off of WiFi, and the subdomain worked just fine. So it wasn't the site, it was the internet service!
I restarted the router, that had no impact. Neither did ipconfig /xxxx.
After MORE poking and prodding, I logged in to my router and removed Google DNS, instead letting it use my ISP's dynamic DNS. After that, the subdomain came up just fine!
Even weirder... I immediately set it back to Google DNS, and... it came up, just fine!
Since it came back up the second time around, I guess that Google DNS isn't blocking the subdomain? But what I can't figure out is why there was a problem in the first place, and whether it would have affected anyone else using Google DNS. Or worse, whether this problem is likely to happen again and affect my site(s) users?