Was about to message and ask if this was region locked to North America or something.

Yeah, the "posted on the front page of HN" DDOS :S

Strange. Both servers at the system level stopped accepting TCP packets. It might've been my cloud provider trying to mitigate an attack. I guess I shouldn'tve killed the server. Putting it back up now.

Most likely no DOS, just us HNers :)

Turned out to be my email service blocking me for "suspicious activity". Error logs weren't helpful for some reason. I didn't realize my server would crash if it couldn't do an initial connection to the email server.