大家好，想跟大家請教一個問題。
我有一個web服務，他是軟體本身的，但他不支援https，依據文件說明，他需要使用nginx，來做反向代理，達成https的功能。
但是我在設定上碰到點問題，目前如果使用預設443 Port看起來可以。但是因為防火牆上443被其他占用，所以我只能改成別的Port，但改完以後，似乎有時候頁面切換，他會跳回預設的443，可能是我設定錯誤，所以想請大家幫忙。

#odoo server
upstream xxxx.XXXXXXXXXX.com {
 server 127.0.0.1:8099; <<(軟體本身的預設webport)
}

# http -> https
server {
   listen 80;
   server_name xxxx.XXXXXXXXXX.com;
   rewrite ^(.*) https://$host$1 permanent;
}

server {
 listen 9443;
 server_name xxxx.XXXXXXXXXX.com;
 proxy_read_timeout 720s;
 proxy_connect_timeout 720s;
 proxy_send_timeout 720s;

 # Add Headers for odoo proxy mode
 proxy_set_header X-Forwarded-Host $host;
 proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
 proxy_set_header X-Forwarded-Proto $scheme;
 proxy_set_header X-Real-IP $remote_addr;

 # SSL parameters
 ssl on;
 ssl_certificate /etc/letsencrypt/live/xxxx.XXXXXXXXXX.com/fullchain.pem;
 ssl_certificate_key /etc/letsencrypt/live/xxxx.XXXXXXXXXX.com/privkey.pem;
 ssl_session_timeout 30m;
 ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
 ssl_ciphers 'ECDHE-RSA-AES128-GCM-SHA256:ECDHE-...................................省略:!MD5:!PSK:!aECDH:!EDH-DSS-DES-CBC3-SHA:!EDH-RSA-DES-CBC3-SHA:!KRB5-DES-CBC3-SHA';
 ssl_prefer_server_ciphers on;

 # log
 access_log /var/log/nginx/odoo.access.log;
 error_log /var/log/nginx/odoo.error.log;


 # Redirect requests to odoo backend server
 location / {
   proxy_redirect off;
   proxy_pass http://xxxx.XXXXXXXXXX.com;
 }

 # common gzip
 gzip_types text/css text/scss text/plain text/xml application/xml application/json application/javascript;
 gzip on;