NGINX http proxy_pass over ssl - ssl

Question

I'm trying to set up SSL on my nginx server, it works on the plain site which is just the nginx welcome default page, but when I try any of the configured proxy_pass locations I get a cloudflare 526 Invalid SSL certificate error which rapidly flicks to a 502 bad gateway. The certificate I'm using is self signed and cloudflare SSL is set to full (not strict).
This is the error I get on my logs:
2017/11/28 22:59:10 [error] 11457#11457: *2 upstream prematurely closed connection while reading response header from upstream, client: 141.101.104.32, server: web1.olympiccode.net, request: "GET /r/ HTTP/1.1", upstream: "http://127.0.0.1:2000/r/", host: "web1.olympiccode.net", referrer: "https://web1.olympiccode.net/r"
This is my config:
user www-data;
worker_processes 1;
pid /run/nginx.pid;
events {
worker_connections 1024;
}
http {
include mime.types;
default_type application/octet-stream;
send_timeout 1800;
sendfile on;
keepalive_timeout 6500;
ssl_certificate server.crt;
ssl_certificate_key server.key;
ssl_session_timeout 5m;
ssl_protocols SSLv2 SSLv3 TLSv1;
ssl_ciphers ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP;
ssl_prefer_server_ciphers on;
server {
listen 80;
server_name web1.olympiccode.net;
return 200 "hi";
}
# HTTPS server
server {
listen 443 ssl;
server_name web1.olympiccode.net;
root /usr/share/nginx/html;
ssl on;
location / {
try_files $uri $uri/ =404;
}
location /r/ {
auth_basic "RethinkDB - Web Panel";
auth_basic_user_file /etc/nginx/.rethinkdb.pass;
proxy_pass http://localhost:2000;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Client-Verify SUCCESS;
proxy_set_header X-Client-DN $ssl_client_s_dn;
proxy_set_header X-SSL-Subject $ssl_client_s_dn;
proxy_set_header X-SSL-Issuer $ssl_client_i_dn;
proxy_read_timeout 1800;
proxy_connect_timeout 1800;
}
location /status/ {
proxy_pass http://localhost:19999;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Client-Verify SUCCESS;
proxy_set_header X-Client-DN $ssl_client_s_dn;
proxy_set_header X-SSL-Subject $ssl_client_s_dn;
proxy_set_header X-SSL-Issuer $ssl_client_i_dn;
proxy_read_timeout 1800;
proxy_connect_timeout 1800;
}
}
}
#mail {
# # See sample authentication script at:
# # http://wiki.nginx.org/ImapAuthenticateWithApachePhpScript
#
# # auth_http localhost/auth.php;
# # pop3_capabilities "TOP" "USER";
# # imap_capabilities "IMAP4rev1" "UIDPLUS";
#
# server {
# listen localhost:110;
# protocol pop3;
# proxy on;
# }
#
# server {
# listen localhost:143;
# protocol imap;
# proxy on;
# }
#}