Sorry, everyone. I'm the site's author, and I increased the ulimit and worker_connections to 4096, so you should see better perfomance and no more errors now.

Sorry, everyone. I'm the site's author, and I increased the ulimit and worker_connections to 4096, so you should see better perfomance and no more errors now. My apologies...I'm a web guy, not a networking guy. Rookie mistake. And yes, you did break it :/