Hi,
I have a WordPress site on Ubuntu 24.04 with Nginx 1.24.0 as web server software. The site is behind a NetworkSolutions load balancer which handles the SSL cert.

I am running into a "ERR_CONNECTION_RESET " error when I change the Load Balancer to only accept HTTPS (443) and configure my default Nginx config file to listen on port 443. Everything is fine on 80.

My config file:

```
server {

listen 443;
listen [::]:443;
server_name site.mysite.com;


add_header X-Frame-Options "SAMEORIGIN";
add_header X-XSS-Protection "1; mode=block";
add_header X-Content-Type-Options "nosniff";

root /var/www/html/web;
index index.php index.html index.htm;

charset utf-8;

location / {
try_files $uri $uri/ /index.php?$query_string;
}

location = /favicon.ico {
access_log off;
log_not_found off;
}

location = /robots.txt {
access_log off;
log_not_found off;
}

location ~ \.php$ {
include snippets/fastcgi-php.conf;
fastcgi_pass unix:/run/php/php8.2-fpm.sock;
#fastcgi_index index.php;
include fastcgi_params;
}

location ~ /\.(?!well-known).* {
deny all;
}

error_page 404 /index.php;

access_log /var/log/nginx/site.mysite.com.access.log;
error_log /var/log/nginx/site.mysite.com.error.log error;

}
```

In wp-config, this logic is implemented to force HTTPS:
```
if ($_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https')
$_SERVER['HTTPS']='on';

```

The firewall on the server has all necessary ports open as well.

Another note as this all works great on port 80. The SSL cert works and the ```if``` statement in the wp-config file is commented out so ``` $_SERVER['HTTPS']='on';``` makes everything HTTPS, but I do not want to do this.

Any thoughts on why 443 is throwing this error?

Thanks in advance