Let me give you a real-life example. My current customer has a very complex and highly secure multi-tiered network. The Internet is not directly accessible from any end-user network tier. Internet access is by proxy server only, with explicit approval granted to individuals, not to all employees. Authentication is required for access, and the access is by monitored URL only, and many URLs are blocked due to key words within them, not just domain names. (Good luck trying to read an article about Ebay's business practices or technology choices, for example. The four letters ...ebay.. -anywhere- within a URL cause it to be blocked.)
Can I get around this very strict infrastructure? Absolutely. Will I? No. I'd like to keep my customer.
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