How-to guides
Why Is The Pirate Bay Blocked? Courts in the UK, Australia, India, Germany, France and many other countries have ordered ISPs to block TPB domains. New domains get blocked within weeks. View our teste
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One of the most common SSL installation errors is a certificate and private key mismatch. You install a new SSL certificate, restart your web server — and it…
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HTTP headers reveal how a server is configured — caching, security policies, server software, and more. Here is how to inspect headers and what to look for.
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Open ports are potential entry points for attackers. Here is how to scan for open ports, what each common port does, and how to close the ones you do not need.
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Cloudflare hides a website's real server IP behind its proxy. Here is how Cloudflare IP resolution works and why the real IP sometimes leaks.
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Regular expressions are powerful but hard to remember. Here is the essential regex cheat sheet plus how to test and debug any regex pattern online.
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Fake and disposable email addresses inflate your list, trigger spam filters, and waste resources. Here is how to verify any email address before you send.
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UTM parameters let you track exactly where your traffic comes from in Google Analytics. Here is what each parameter means and how to build UTM links correctly.
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SPF, DKIM and DMARC stop spammers from sending email as your domain. Here is what each record does and how to set them up correctly.
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