I guess you have som configuration issues in nginx!
Here is my config! Maybe this will help you 
Server block
server
{
listen 443 ssl;
location @nodebb
{
proxy_pass http://www-nodebb-se:4567;
}
location ~ ^\/assets\/(.*)
{
root /server/nodejs/nodebb.se/www/;
try_files /build/public/$1 /public/$1 @nodebb;
}
location /plugins/
{
root /server/nodejs/nodebb.se/www/build/public/;
try_files $uri @nodebb;
}
location /
{
proxy_pass http://www-nodebb-se:4567;
}
proxy_http_version 1.1;
proxy_redirect off;
proxy_set_header Connection "upgrade";
proxy_set_header Host $http_host;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_set_header X-NginX-Proxy true;
proxy_set_header X-Real-IP $remote_addr;
server_name nodebb.se www.nodebb.se;
ssl_certificate /server/nginx/ssl/nodebb.se.crt;
ssl_certificate_key /server/nginx/ssl/nodebb.se.key;
if ($host != 'www.nodebb.se')
{
rewrite ^/(.*)$ https://www.nodebb.se/$1 permanent;
}
}
Global block
ssl_ciphers EECDH+CHACHA20:EECDH+AES128:RSA+AES128:EECDH+AES256:RSA+AES256:EECDH+3DES:RSA+3DES:!MD5;
ssl_prefer_server_ciphers on;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_session_cache shared:SSL:10m;
ssl_session_timeout 10m;
BTW, if someone know any tweeks please advice
And plz explain why!