WordPress Website not rendered properly via nginx reverse proxy

[Nikolaos Milas]

Hello,

We are using nginx on a server as a reverse proxy and it works fine 
serving multiple websites.

Now I am trying to reverse proxy another one, a WP website, in the same 
way, but it won't render correctly.

I can only see the main page areas and only some text at some places, 
but most content, including images, is missing.

What may be wrong?

I have checked error logs but I don't see anything logged.

Any suggestions will be most appreciated.

In the config below, the original site (http://example.private.noa.gr) 
works without issues (it is rendered properly), but the proxied one 
(https://example.noa.gr) does not.

Here is the config:

===========================================================

server {
     listen       80;
     listen       [::]:80;

     server_name  example.noa.gr;

     return 301 https://example.noa.gr/$request_uri;

     access_log  /var/log/example_http_access_log main;
     error_log /var/log/example_http_error_log warn;

}

server {

     listen       443 ssl;
     listen       [::]:443 ssl;

     server_name  example.noa.gr;

     allow 127.0.0.1;
     allow ::1;
     allow 10.10.0.0/16;
     deny all;

     ssl_certificate /etc/pki/tls/certs/star_noa_gr_cert-current.crt;
     ssl_certificate_key /etc/pki/tls/private/star_noa_gr-1243437.key;

     access_log  /var/log/example_https_access_log main;
     error_log /var/log/example_https_error_log warn;

     client_max_body_size 50M;

     location / {

         proxy_pass http://example.private.noa.gr:80/;

         proxy_set_header Host example.private.noa.gr;

         proxy_set_header X-Forwarded-Host   $http_host;
         proxy_set_header X-Forwarded-Server $http_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;

         proxy_buffer_size                   16k;
         proxy_max_temp_file_size            2048m;
         proxy_buffers                       8 16k;

     }
}

===========================================================

(Note: the buffer directives were added to avoid the "an upstream 
response is buffered to a temporary file" error.)

Thanks in advance.

Best regards,
Nick

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