Symfony port redirection behind reverse proxy

I have a Symfony 3.2 application (running on port 8443) using FosUserBundle. When anonymous users access 'https://[myurl].com:8443', they are redirected to 'https://[myurl].com:8443/login' for the login process. This redirection is working fine when accessing the application but now, we want to use a reverse proxy to forward the requests from customers to the application. Customers would use standard https port 443.

What happens is the following : Users access the application with 'https://myurl.com'.
The request is forwarded by the reverse proxy to the web server (IIS) hosting the application on port 8443.
The user making the request is redirected to 'https://myurl.com:8443/login' which does not work because 8443 is only opened server-side.

I tried different solutions in symfony but was not able to make it work :
-set up the reverse proxy in symfony : Request::setTrustedProxies(array('123.456.78.89'));
-set http_port/https_port in config.yml
-set $_SERVER['SERVER_PORT'] = 443;

Any idea on how can I solve this ?

Thanks

from Symfony port redirection behind reverse proxy