Why have a error 502 Bad Gateway Nginx, I have installed Engintron on my WHM

Question

This is the configuration of default.conf:

server {
#listen 80 default_server;
listen [::]:80 default_server ipv6only=off;

server_name localhost;

deny all; # DO NOT REMOVE OR CHANGE THIS LINE - Used when Engintron is disabled to block Nginx from becoming an open proxy

# Set the port for HTTP proxying
set $PROXY_TO_PORT 80;

include common_http.conf;

location = /nginx_status {
    stub_status;
    access_log off;
    log_not_found off;
    # Uncomment the following 2 lines to make the Nginx status page private.
    # If you do this and you have Munin installed, graphs for Nginx will stop working.
    #allow 127.0.0.1;
    #deny all;
}

location = /whm-server-status {
    proxy_pass http://127.0.0.1:80; # Apache Status Page
    # Comment the following 2 lines to make the Apache status page public
    allow 127.0.0.1;
    deny all;
  }
}

These are the ports:

Apache non-SSL IP/port: 0.0.0.0:80

Apache SSL port: 0.0.0.0:443

These are Logs:

2022/11/02 16:52:42 [emerg] 20632#20632: bind() to [::]:80 failed (98: Address already in use)
2022/11/02 16:52:42 [emerg] 20632#20632: bind() to [::]:443 failed (98: Address already in use)

I already tried to kill the processes listening to the same port and I get this error:

400 Bad Request request header or cookie too large

or my site stops working

I hope you can help me.