Failed to make connection backend - apache

Question

I am running Apache/2.4.51, on Redhat Linux 9. I have disabled Selinux and set it to minimum. I have opened the firewall to the necessary ports. Lastly, I have changed the Vhost from IP based, to ''. When I change it to '' it will skip the Vhost and move to the next one for the ssl cert (if that makes sense)
I am moving servers, and this was working on Centos 8. I copied/pasted the httpd.conf and nginx.conf files.
I am getting the following : 503 Error
failed to make connection to backend: 38.17.51.135,
referer: https://www.fluttercode.com/service-worker.js
My Apache config files:
httpd.conf
<VirtualHost 38.17.51.135:80>
ServerAdmin webmaster#fluttercode.com
ServerName www.fluttercode.com
ServerAlias fluttercode.com
RewriteEngine on
RewriteCond %{SERVER_NAME} =fluttercode.com [OR]
RewriteCond %{SERVER_NAME} =www.fluttercode.com
RewriteRule ^ https://%{SERVER_NAME}%{REQUEST_URI} [END,NE,R=permanent]
</VirtualHost>
httpd-le-ssl.conf:
<IfModule mod_ssl.c>
<VirtualHost 38.17.51.135:443>
ServerAdmin webmaster#fluttercode.com
ServerName www.fluttercode.com
ServerAlias fluttercode.com
ErrorLog /home/fluttercode/web_logs/error_log
CustomLog /home/fluttercode/web_logs/hit_log combined
RewriteEngine on
RewriteCond %{SERVER_NAME} =fluttercode.com
RewriteRule ^ https://www.fluttercode.com%{REQUEST_URI} [END,NE,R=permanent]
SSLProxyEngine on
ProxyRequests Off
ProxyPreserveHost On
ProxyPass / https://38.17.51.135:4200/
ProxyPassReverse / https://38.17.51.135:4200/
Include /etc/letsencrypt/options-ssl-apache.conf
SSLCertificateFile /etc/letsencrypt/live/fluttercode.com/fullchain.pem
SSLCertificateKeyFile /etc/letsencrypt/live/fluttercode.com/privkey.pem
</VirtualHost>
</IfModule>
My nginx.conf (discourse.conf)
server {
access_log /var/log/nginx/access.log log_discourse;
listen 4200 default ssl;
gzip on;
gzip_vary on;
gzip_min_length 1000;
gzip_comp_level 5;
gzip_types application/json text/css text/javascript application/x-javascript application/javascript image/svg+xml application/wasm;
gzip_proxied any;
# Uncomment and configure this section for HTTPS support
# NOTE: Put your ssl cert in your main nginx config directory (/etc/nginx)
#
# rewrite ^/(.*) https://www.fluttercode.com/$1 permanent;
#
# listen 443 ssl;
ssl_certificate /etc/letsencrypt/live/fluttercode.com/fullchain.pem;
ssl_certificate_key /etc/letsencrypt/live/fluttercode.com/privkey.pem;
ssl_protocols TLSv1 TLSv1.1 TLSv1.2;
ssl_ciphers HIGH:!aNULL:!MD5;
#
server_name www.fluttercode.com;
server_tokens off;
sendfile on;
keepalive_timeout 65;
# maximum file upload size (keep up to date when changing the corresponding site setting)
client_max_body_size 10m;
# path to discourse's public directory
set $public /var/www/discourse/public;
# without weak etags we get zero benefit from etags on dynamically compressed content
# further more etags are based on the file in nginx not sha of data
# use dates, it solves the problem fine even cross server
etag off;
# prevent direct download of backups
location ^~ /backups/ {
internal;
}
# bypass rails stack with a cheap 204 for favicon.ico requests
location /favicon.ico {
return 204;
access_log off;
log_not_found off;
}
location / {
root $public;
add_header ETag "";
# auth_basic on;
# auth_basic_user_file /etc/nginx/htpasswd;
location ~ ^/uploads/short-url/ {
proxy_set_header Host $http_host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Request-Start "t=${msec}";
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $thescheme;
proxy_pass http://discourse;
break;
}
location ~ ^/secure-media-uploads/ {
proxy_set_header Host $http_host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Request-Start "t=${msec}";
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $thescheme;
proxy_pass http://discourse;
break;
}
location ~* (fonts|assets|plugins|uploads)/.*\.(eot|ttf|woff|woff2|ico|otf)$ {
expires 1y;
add_header Cache-Control public,immutable;
add_header Access-Control-Allow-Origin *;
}
location = /srv/status {
access_log off;
log_not_found off;
proxy_set_header Host $http_host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Request-Start "t=${msec}";
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $thescheme;
proxy_pass http://discourse;
break;
}
# some minimal caching here so we don't keep asking
# longer term we should increase probably to 1y
location ~ ^/javascripts/ {
expires 1d;
add_header Cache-Control public,immutable;
add_header Access-Control-Allow-Origin *;
}
location ~ ^/assets/(?<asset_path>.+)$ {
expires 1y;
# asset pipeline enables this
# brotli_static on;
gzip_static on;
add_header Cache-Control public,immutable;
# HOOK in asset location (used for extensibility)
# TODO I don't think this break is needed, it just breaks out of rewrite
break;
}
location ~ ^/plugins/ {
expires 1y;
add_header Cache-Control public,immutable;
add_header Access-Control-Allow-Origin *;
}
# cache emojis
location ~ /images/emoji/ {
expires 1y;
add_header Cache-Control public,immutable;
add_header Access-Control-Allow-Origin *;
}
location ~ ^/uploads/ {
# NOTE: it is really annoying that we can't just define headers
# at the top level and inherit.
#
# proxy_set_header DOES NOT inherit, by design, we must repeat it,
# otherwise headers are not set correctly
proxy_set_header Host $http_host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Request-Start "t=${msec}";
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $thescheme;
proxy_set_header X-Sendfile-Type X-Accel-Redirect;
proxy_set_header X-Accel-Mapping $public/=/downloads/;
expires 1y;
add_header Cache-Control public,immutable;
## optional upload anti-hotlinking rules
#valid_referers none blocked mysite.com *.mysite.com;
#if ($invalid_referer) { return 403; }
# custom CSS
location ~ /stylesheet-cache/ {
add_header Access-Control-Allow-Origin *;
try_files $uri =404;
}
# this allows us to bypass rails
location ~* \.(gif|png|jpg|jpeg|bmp|tif|tiff|ico|webp)$ {
add_header Access-Control-Allow-Origin *;
try_files $uri =404;
}
# SVG needs an extra header attached
location ~* \.(svg)$ {
}
# thumbnails & optimized images
location ~ /_?optimized/ {
add_header Access-Control-Allow-Origin *;
try_files $uri =404;
}
proxy_pass http://discourse;
break;
}
location ~ ^/admin/backups/ {
proxy_set_header Host $http_host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Request-Start "t=${msec}";
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $thescheme;
proxy_set_header X-Sendfile-Type X-Accel-Redirect;
proxy_set_header X-Accel-Mapping $public/=/downloads/;
proxy_pass http://discourse;
break;
}
# This big block is needed so we can selectively enable
# acceleration for backups, avatars, sprites and so on.
# see note about repetition above
location ~ ^/(svg-sprite/|letter_avatar/|letter_avatar_proxy/|user_avatar|highlight-js|stylesheets|theme-javascripts|favicon/proxied|service-worker) {
proxy_set_header Host $http_host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Request-Start "t=${msec}";
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $thescheme;
# if Set-Cookie is in the response nothing gets cached
# this is double bad cause we are not passing last modified in
proxy_ignore_headers "Set-Cookie";
proxy_hide_header "Set-Cookie";
proxy_hide_header "X-Discourse-Username";
proxy_hide_header "X-Runtime";
# note x-accel-redirect can not be used with proxy_cache
proxy_cache one;
proxy_cache_key "$scheme,$host,$request_uri";
proxy_cache_valid 200 301 302 7d;
proxy_cache_bypass $bypass_cache;
proxy_pass http://discourse;
break;
}
# we need buffering off for message bus
location /message-bus/ {
proxy_set_header X-Request-Start "t=${msec}";
proxy_set_header Host $http_host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $thescheme;
proxy_http_version 1.1;
proxy_buffering off;
proxy_pass http://discourse;
break;
}
# this means every file in public is tried first
try_files $uri #discourse;
}
location /downloads/ {
internal;
alias $public/;
}
location #discourse {
proxy_set_header Host $http_host;
proxy_set_header X-Request-Start "t=${msec}";
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto $thescheme;
proxy_pass http://discourse;
}
Any help on config settings or linux settings to fix this problem would be greatly appreciated.