Can anyone help me with a configuration of keycloak (port 8180) and tomcat (port 8080) running on the same host/domain having nginx as reverse proxy server in front of it (new to nginx).

Accessed on individual ports they run perfectly but when going over nginx, tomcat address (localhost) works but keycloak (localhost/auth) won't.

Here's my nginx configuration:

user www-data;
worker_processes 4;
pid /run/nginx.pid;

events {
worker_connections 1024;
# multi_accept on;
}

http {
server_tokens off; #hides nginx version and OS running on
include /etc/nginx/mime.types;

upstream tomcat_server {
server localhost:8080;
}
upstream keycloak_server {
server localhost:8180;
}

server {
listen 80;
server_name localhost;

location / {
try_files $uri $uri/index.hml /maintenance.html @tomcat;
}

location @tomcat {
proxy_pass http://tomcat_server;
proxy_set_header Host $host;
}

location /auth/ {
proxy_pass http://keycloak_server;

proxy_set_header Host $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 $scheme;
}

}
}

Thanks,

Adrian