I have not used shields up in years but today I did and with adguard active I get following. The ShieldsUP! system incorporates technology designed to circumvent many common web browser proxies so that most of our visitors never encounter this special interception page. This built-in circumvention technology is one of several reasons why ShieldsUP!'s tests are often more accurate than other web-based online security tests. However, in this case, it appears that our automatic proxy circumvention system has failed to determine your machine's true IP address, so the results of further tests would not be trustworthy. The worrisome header contained in your request is: https://www.grc.com/image/transpixel.gif X-Forwarded-For: 184.108.40.206 The presence of this header is indicative of an intermediate proxy, as discussed above. We are unable to bypass this proxy, since even your browser's secure SSL connections are being intercepted. If you are able to disable your browser's use of this proxy we'll be able to check your system, but until then we are unable to proceed.