Webrdp and websockets not working with Nginx Reverse Proxy

Hi,

It seems like i am having some issues getting WebRDP and Websockets to work in general. I am using Nginx reverse proxy and i do not get notifications, chats do not work correctly most of the time and worst of all. WebRDP does not work at all.
it is not a major issue as i have Endpoint Central for RDP. But as it is rather unreliable, it would be great to have a second option!.

I was hoping someone might have figured it out and could spot the mistakes in my Nginx conf or maybe even just give a few performance tips for the config?

#SDP WebRDP port = 8083
#SDP Server = 10.100.200.200
#SDP Server HTTPS Port = 8080
################################################################################
#HTTP to HTTPS Forward
server {
listen 80;
server_name servicedesk.domain.com;
return 301 https://servicedesk.domain.com$request_uri;
}
################################################################################
#Vhost for port 443 HTTPS forward to port 8080
server {
listen 443 ssl http2;
server_name servicedesk.domain.com;
#SSL Config
ssl_certificate /etc/ssl/domain.com.bundle.pem;
ssl_certificate_key /etc/ssl/private.key;
ssl_session_cache builtin:1000 shared:SSL:10m;
ssl_session_timeout 10m;
add_header Strict-Transport-Security "max-age=31536000; includeSubdomains";
ssl_protocols SSLv3 TLSv1 TLSv1.1 TLSv1.2;
ssl_ciphers EECDH+AESGCM:EDH+AESGCM:AES256+EECDH:AES256+EDH:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384:DHE-RSA-AES128-GCM-SHA256:ECDHE-RSA-AES256-SHA384:ECDHE-RSA-AES128-SHA256:ECDHE-RSA-AES256-SHA:ECDHE-RSA-AES128-SHA:DHE-RSA-AES256-SHA256:DHE-RSA-AES128-SHA256:DHE-RSA-AES256-SHA:DHE-RSA-AES128-SHA:AES256-GCM-SHA384:AES128-GCM-SHA256:AES256-SHA256:AES128-SHA256:AES256-SHA:AES128-SHA:HIGH:!aNULL:!eNULL:!EXPORT:!DES:!MD5:!PSK:!RC4:!3DES:!CAMELLIA;
ssl_prefer_server_ciphers on;
#Additional settings
client_max_body_size 50M;
keepalive_timeout 70;
port_in_redirect off;
include /etc/nginx/mime.types;
#Log Files for port 443
access_log /var/log/nginx/sdp443.access.log;
error_log /var/log/nginx/sdp443.error.log;
#Location for port 443 forward to 8080
location / {
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Real-Host $host;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $scheme;
proxy_pass https://10.100.200.200:8080;
proxy_read_timeout 120;
# WebSocket support
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "upgrade";
}
}
################################################################################
#Vhost port 8083 for WebRDP
server{
listen 8083 ssl http2;
server_name servicedesk.domain.com;
#SSL Config for port 8083 WEBRDP
ssl_certificate /etc/ssl/domain.com.bundle.pem;
ssl_certificate_key /etc/ssl/private.key;
ssl_session_timeout 20m;
ssl_ciphers ECDHE-RSA-AES128-GCM-SHA256:ECDHE:ECDH:AES:HIGH:!NULL:!aNULL:!MD5:!ADH:!RC4;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_prefer_server_ciphers on;
ssl_verify_client off;
#Additional settings
client_max_body_size 50M;
keepalive_timeout 70;
port_in_redirect off;
include /etc/nginx/mime.types;
#Location for 8083
location /{
proxy_http_version 1.1;
proxy_pass https://10.100.200.200:8083;
proxy_set_header Host $host;
proxy_set_header Upgrade $http_upgrade;
proxy_set_header Connection "upgrade";
}
}