502 Proxy Error when using an anonymous IP

.htaccess configuration

[ilustrate]

Proxy Error

The proxy server received an invalid response from an upstream server.
The proxy server could not handle the request GET [webmasterworld.com...]

Reason: DNS lookup failure for: www.webmasterworld.com

I got the following error.
After attempting to sign on with a new service called Anonymizer 2005.

I think this is cool, but how can I configure my .htaccess file to deny the same? I would like to have this on my site as well.

[py9jmas]

This looks like the proxy failed to resolve www.webmasterworld.com to an IP address. It doesn't look to have anything to do with access controls on Webmaster World's website.