First you want to go to inc/functions.php, at line 5584 (May be different if you use google SEO), you will look for a function called "fetch_remote_file". This function allows for a douchebag to get the real IP address of the forum.
In order to stop this, we will use this code.
This is within the section that says if(function_exists("curl_init")) for those of you who have edited their functions.php file, Insert the following at or near the beginning of this block.
curl_setopt($ch, CURLOPT_PROXY, "127.0.0.1");
curl_setopt($ch, CURLOPT_PROXYPORT, "8080");
curl_setopt($ch, CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
Replace the IP address and port with the corresponding ones of your proxy. If it's an HTTP proxy, replace CURLPROXY_SOCKS5 with CURLPROXY_HTTP.