Socket.io XMLHttpRequest CORS Problem

1

I just installed erpnext and the wizard is launched but i can’t complete the process due some errors:

GET http://erp.example.pro:9000/socket.io/?EIO=3&transport=polling&t=Ma0_SMi net::ERR_ABORTED 404 (Not Found)
Access to XMLHttpRequest at ‘http://erp.example.pro:9000/socket.io/?EIO=3&transport=polling&t=Ma0_SMi’ from origin ‘http://erp.magana.pro’ has been blocked by CORS policy: No ‘Access-Control-Allow-Origin’ header is present on the requested resource.

My nginx block is like this:
location /socket.io {

                proxy_http_version 1.1;
                proxy_set_header Upgrade $http_upgrade;
                proxy_set_header Connection "Upgrade";
                proxy_set_header X-Frappe-Site-Name erp.example.pro;
                proxy_set_header Origin $scheme://$http_host;
                proxy_set_header Host $host;

                proxy_pass http://frappe-bench-socketio-server;

                add_header 'Access-Control-Allow-Origin' '*' always;
                add_header 'Access-Control-Allow-Methods' 'GET, POST, PUT, DELETE, OPTIONS' always;
                add_header 'Access-Control-Allow-Credentials' 'true' always;
                add_header 'Access-Control-Allow-Headers' 'DNT, Authorization, X-CustomHeader, Keep-Alive, User-Agent, X-Requested-With, Content-Type, Content-Length';
                add_header 'Access-Control-Expose-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modi$
        }

What i’m missing ?

Thanks in advance
Pepe

2

Well i manage to install ERPNext following this steps:
wget https://raw.githubusercontent.com/frappe/bench/master/playbooks/install.py
sudo python install.py --production --user frappe
cd frappe-bench
bench drop-site site1.local
bench new-site erp.mysite.com
bench --site erp.mysite.com install-app erpnext
bench setup socketio
bench setup supervisor
bench setup nginx
sudo service nginx reload
sudo supervisorctl reload

3

Actually the problem was that port 9000 was already in use by docker
I found that with lsof -i tcp:9000