"require_channel: https" causes Error 310, Too Many Redirects

Question

If I try and force certain areas of my site to use https I get

Error 310 (net::ERR_TOO_MANY_REDIRECTS): There were too many redirects.

If I just use https:// myself the page renders fine, it's only when I force it to use https.

This is my security.yml, but I get the same error if I use annotations too.

security:
    encoders:
        FOS\UserBundle\Model\UserInterface: sha512

    role_hierarchy:
        ROLE_ADMIN:       ROLE_USER
        ROLE_MERCHANT:    ROLE_USER
        ROLE_SUPER_ADMIN: [ROLE_USER, ROLE_ADMIN, ROLE_ALLOWED_TO_SWITCH, ROLE_MERCHANT]

    providers:
        fos_userbundle:
            id: fos_user.user_provider.username_email

    firewalls:
        dev:
            pattern:  ^/(_(profiler|wdt)|css|images|js)/
            security: false
        main:
            pattern: ^/
            form_login:
                provider: fos_userbundle
                csrf_provider: form.csrf_provider
                default_target_path: /dashboard
            logout:       true
            anonymous:    true

    access_control:
        - { path: ^/login$, role: IS_AUTHENTICATED_ANONYMOUSLY}
        - { path: ^/login_check$, role: IS_AUTHENTICATED_ANONYMOUSLY }
        - { path: ^/register, role: IS_AUTHENTICATED_ANONYMOUSLY }
        - { path: ^/resetting, role: IS_AUTHENTICATED_ANONYMOUSLY }
        - { path: ^/admin/, role: ROLE_ADMIN, requires_channel: https }
        - { path: ^/dashboard, role: ROLE_USER, requires_channel: https}
        - { path: ^/invoice/new, role: ROLE_MERCHANT, requires_channel: https}
        - { path: ^/invoice, role: ROLE_USER, requires_channel: https}

I'm running on nginx rather than Apache too.

Answer 1

Try adding

fastcgi_param HTTPS on;

To your nginx vhost, that will help Symfony recognize that the request is a SSL request, symfony is checking against the HTTPS global variable to check if the request is SSL or not and redirect acordingly, if that variable is not set inside by the webserver on a SSL request symfony will try to redirect causing the loop :)

More info over here.. http://blog.servergrove.com/2011/04/04/symfony2-quick-tip-generateurl-with-https-on-nginx/