too many redirects for wordpress on nginx with apa

I have just installed wordpress on ubuntu 14.04 LTS. Nginx acts as reverse proxy for apache2.

wp-admin is working fine, but I am unable to open the homepage.

Nginx Server Code:

server {
        listen 80;

        root /var/www/html/testblog;
        index index.php index.html index.htm;

        server_name testblog.com;

        location / {
                # try_files $uri $uri/ =404;
                try_files $uri $uri/ /index.php?q=$uri&$args;
        }

        error_page 404 /404.html;

        error_page 500 502 503 504 /50x.html;
        location = /50x.html {
                root /usr/share/nginx/html;
        }

        location ~ \.php$ {
                proxy_set_header X-Real-IP  $remote_addr;
                proxy_set_header X-Forwarded-For $remote_addr;
                proxy_set_header Host $host;
                proxy_pass http://127.0.0.1:8182;
        }

        location ~ /\.ht {
                deny all;
        }
}

Apache Virtual Host Conf:

<VirtualHost *:8182>
        ServerName testblog.com

        ServerAdmin webmaster@localhost
        DocumentRoot /var/www/html/testblog

        ErrorLog ${APACHE_LOG_DIR}/errortest.log
        CustomLog ${APACHE_LOG_DIR}/accesstest.log combined
</VirtualHost>

My /etc/hosts:

127.0.0.1       localhost
127.0.0.1       ubuntu
127.0.1.1       testblog.com

I have all the wp files in the folder /var/www/html/testblog/.

testblog.com/wp-admin: working fine.

testblog.com: giving too many redirects.

Here is my settings page:

I guess my settings are correct. I have tried defining WP_HOME and WP_SITEURL in wp-config.php, but no luck.

My /var/www/html/testblog/.htaccess:

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress

testblog.com/wp-admin: working.

testblog.com: giving too many redirects error

Any help is highly appreciated.

Edit: I have already disabled all the plugins.

If Apache2 is running WordPress, you need to configure nginx to proxy everything. At the moment you have both nginx and Apache2 rewriting URIs to /index.php, and because nginx does it first, WordPress never sees the original URI.

Start with this:

server {
    listen 80;
    server_name testblog.com;

    location / {
        proxy_set_header X-Real-IP  $remote_addr;
        proxy_set_header X-Forwarded-For $remote_addr;
        proxy_set_header Host $host;
        proxy_pass http://127.0.0.1:8182;
    }
}

And if you decide to allow some of the static URIs to be served by nginx fine. But you can't let nginx map URIs to /index.php because that will not work.