Several times on different websites, I have seen Sophos UTM block a website with nothing more than "Invalid Response". So far, all of my attempts to bypass this block for specific URLs have failed.
* What does "Invalid Response" mean?
* What is the correct way to unblock a specific URL that gives an "Invalid Response" error?
Here is an example of a web page that is blocked by Sophos UTM with "Invalid Response":
http://arstechnica.com/ars-staff-pgp-keys/
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I tried the Sophos UTM manual and searching the web, but there is little information available. Where should I go to learn more?
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