So everything was working great but due to the nature of my site and it's users, SSL is required, especially since I'll be using SSO exclusively for login. Once I enabled SSL I started receiving both 400 and 522 errors on a certain amount of the

Socket.IO

(socket.io)

polls. I'm not certain what the percentage is of failed polling attempts but it's not 100% because the site still works and some data still makes it through.

Here's a screenshot of the errors in my safari console (yes, it happens in chrome and firefox too)

Image 2015-04-12 at 10.27.45 AM.png

And here's my nginx vhost config

server {
    listen 80;

    server_name forum.nzb.cat;

    return 301    https://forum.nzb.cat$request_uri;

}
server {
    listen 443 ssl;

    server_name forum.nzb.cat;

    ssl_certificate /etc/nginx/ssl/forum.nzb.cat.crt;
    ssl_certificate_key /etc/nginx/ssl/nzbcat.key;

    location / {
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header Host $http_host;
        proxy_set_header X-NginX-Proxy true;

        proxy_pass http://127.0.0.1:4567/;
        proxy_redirect off;

        # Socket.IO Support
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
    }
}

And here's the error in the nginx error.log. I googled and googled and did everything the stack overflow people suggested to no avail:

2015/04/12 10:39:03 [error] 17037#0: *146836 upstream prematurely closed connection while reading response header from upstream, client: xxx.xxx.xxx.xxx, server: forum.nzb.cat, request: "GET /socket.io/?EIO=3&transport=polling&t=1428849532722-383&sid=ECw2nTDnOQgEjGcdAAKp HTTP/1.1", upstream: "http://127.0.0.1:4567/socket.io/?EIO=3&transport=polling&t=1428849532722-383&sid=ECw2nTDnOQgEjGcdAAKp", host: "forum.nzb.cat", referrer: "https://forum.nzb.cat/"

I'm at my wit's end here so any help would be appreciated. I didn't bother commenting out any of the URL's as it's a public site.

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KingCat