nginx subfolder WordPress config

subdomain.com.conf

server {
        listen         80;
        server_name    maindomain.com/forums;

        root /var/www/maindomain.com/forums;
        index index.php index.html index.htm;

        location / {
		index index.html index.php;
                try_files $uri $uri/ /index.php?q=$uri&$args;
                #try_files $uri $uri/ /index.php?q=$uri&$args;
        }
	
        rewrite /wp-admin$ $scheme://$host$uri/ permanent;
        
	location ~* \.(js|css|png|jpg|jpeg|gif|ico)$ {
            expires 24h;
            log_not_found off;
        }

        if ($uri !~ wp-content/plugins) {
            rewrite /files/(.+)$ /wp-includes/ms-files.php?file=$1 last;
        }

	if (!-e $request_filename) {
            rewrite ^/[_0-9a-zA-Z-]+(/wp-.*) $1 last;
            rewrite ^/[_0-9a-zA-Z-]+.*(/wp-admin/.*\.php)$ $1 last;
            rewrite ^/[_0-9a-zA-Z-]+(/.*\.php)$ $1 last;
        }
        
	location ~ \.php$ {
                try_files $uri /index.php;
                autoindex on;
                fastcgi_pass unix:/var/run/php5-fpm.sock;
                fastcgi_index index.php;
                #fastcgi_pass_header Set-Cookie;
                include fastcgi_params;
        }
}