Nginx setup for subdomain on DD-WRT - nginx

Question

I've just installed nginx on my Netgear R7000 with DD-WRT firmware, but I'm unable to set it up to use it as a reverse proxy for my different webservers (running on a public ip).
This is the setup:
user nobody;
worker_processes 1;
#error_log /opt/var/log/nginx/error.log;
#error_log /opt/var/log/nginx/error.log notice;
#error_log /opt/var/log/nginx/error.log info;
pid /opt/var/run/nginx.pid;
events {
worker_connections 64;
}
http {
include mime.types;
default_type application/octet-stream;
server_names_hash_bucket_size 64;
#log_format main '$remote_addr - $remote_user [$time_local] "$request" '
# '$status $body_bytes_sent "$http_referer" '
# '"$http_user_agent" "$http_x_forwarded_for"';
#access_log /opt/var/log/nginx/access.log main;
sendfile on;
#tcp_nopush on;
#keepalive_timeout 0;
keepalive_timeout 65;
#gzip on;
server {
listen 80;
server_name localhost;
#charset koi8-r;
#access_log /opt/var/log/nginx/host.access.log;
location / {
root /opt/share/nginx/html;
index index.html index.htm;
}
#error_page 404 /404.html;
# redirect server error pages to the static page /50x.html
#
error_page 500 502 503 504 /50x.html;
location = /50x.html {
root html;
}
# proxy the PHP scripts to Apache listening on 127.0.0.1:80
#
#location ~ \.php$ {
# proxy_pass http://127.0.0.1;
#}
# pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000
#
#location ~ \.php$ {
# root html;
# fastcgi_pass 127.0.0.1:9000;
# fastcgi_index index.php;
# fastcgi_param SCRIPT_FILENAME /scripts$fastcgi_script_name;
# include fastcgi_params;
#}
# deny access to .htaccess files, if Apache's document root
# concurs with nginx's one
#
#location ~ /\.ht {
# deny all;
#}
}
# another virtual host using mix of IP-, name-, and port-based configuration
#
server {
listen 80;
#listen somename:8080;
server_name xxx.xxxx.it;
location / {
proxy_pass http://192.168.x.xxx:5000;
}
}
# HTTPS server
#
#server {
# listen 443 ssl;
# server_name localhost;
# ssl_certificate cert.pem;
# ssl_certificate_key cert.key;
# ssl_session_cache shared:SSL:1m;
# ssl_session_timeout 5m;
# ssl_ciphers HIGH:!aNULL:!MD5;
# ssl_prefer_server_ciphers on;
# location / {
# root html;
# index index.html index.htm;
# }
#}
}
The error is
nginx: [emerg] bind() to 0.0.0.0:80 failed (98: Address already in use)
What is wrong?
Thank you in advance

Answer 1

Port 80 is the default HTTP port and it is most likely being used by the DD-WRT admin interface. You will need to bind your reverse proxy to a different port or change the port DD-WRT's HTTP server listens on.