Nginx changing redirecting to the wrong port when I access it through a load balancer

Edit – I changed the question as I was wrong about where the error was coming from

I'm having some issues with my Openam deployment and was wondering if you can help.

My set up is as follows: 2 OpenAM servers are set up behind a load balancer (HAproxy). The load balancer is set up behind two reverse proxies (nginx). The two reverse proxies are ser up behind another load balancer (haproxy). So a request will go through Haproxy > nginx > Haproxy > openam

I can access the OpenAM web console through the reverse proxies without a problem. Everything works fine at this level.

The problem is when I access openam through the load balancer in front of the nginx serevrs.

My nginx server is running on port 443. When I access openam through haproxy > nginx >haproxy > openam, nginx it is redirecting the browser using the port 443. This is where the problem is occuring.

The load balancer url I access the login page with is http:/loadbalancerHostname:8090:openam/Login/UI. I can log in successfully. But after the log in the url changes to http:/loadbalancerHostname:443:openam/. The port should not change.

Why is nginx changing the port and how can I stop it?

nginx config :

server {
listen 443;
server_name  oamlb1;


location / {
    proxy_pass        http://oamlb1.mydomain.com:8080;
    proxy_set_header  X-Real-IP $remote_addr;
}
location /openam {
    proxy_pass        http://oamlb1.mydomain.com:8080;
    proxy_set_header  X-Real-IP $remote_addr;
    proxy_set_header  Host oamlb1.mydomain.com:8080;

 }
  }

haproxy config : (This file is for the servers. The file for the reverse proxies is idenical except it points to the reverse proxies)

listen http_proxy :8090
       mode http
       balance roundrobin
       option httpclose
       option forwardfor
       server webA oamreverseproxy1.mydomain.com:443
       option          forwardfor

Thanks