I use Easy Engine with Nginx and it works amazingly well. However I have noticed these errors pop up sometimes:
2015/04/20 05:19:11 [error] 2327#0: *18939 connect() failed (111: Connection refused) while connecting to upstream, client: 18.104.22.168, server: server.com, request: "GET /url/path/ HTTP/1.1", upstream: "fastcgi://127.0.0.1:8000", host: "www.server.com", referrer: "http://www.server.com/url/path/"
Any idea what they could be? Some searching by me found that they appear when the site is down, but my site is up 100%.
It is very highly trafficked though, so I thought it might be that some connection limit was being reached? I get around 1,500 concurrents according to Google Analytics.