hi, have two backends servers running on IIS using ssl port whit real certificate for clientes

how i can balance this two servers using nginx!

thanks

Put them in an upstream, you will have to move the ssl certs to nginx as nginx terminates ssl at the frontend.

See also https://www.digitalocean.com/community/tutorials/how-to-set-up-nginx-load-balancing-with-ssl-termination

---
nginx for Windows http://nginx-win.ecsds.eu/