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Domain Name System blocking, or DNS blocking / filtering, is a strategy for making it difficult for users to locate specific domains or websites on the Internet. It was first introduced in 1997 as a means to block spam email from known malicious IP addresses .
Chinese Firewall Test - Instantly test if a URL is blocked by the Great Firewall of China in real time. Tests for both symptoms of DNS poisoning and HTTP blocking from a number of locations within mainland China. China Firewall Test - Test if any domain is DNS poisoned in China in real-time. DNS poisoning is one way in which websites can be ...
A Domain Name System blocklist, Domain Name System-based blackhole list, Domain Name System blacklist (DNSBL) or real-time blackhole list (RBL) is a service for operation of mail servers to perform a check via a Domain Name System (DNS) query whether a sending host's IP address is blacklisted for email spam. [1]
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If you have given appropriate warnings to a spammer, you should report them on Wikipedia:Administrator intervention against vandalism, where they can be blocked by an administrator. Open proxies used to spam should be reported to Wikipedia:Administrator intervention against vandalism or Wikipedia:WikiProject Open proxies so that they can be ...
NoScript can force the browser to always use HTTPS when establishing connections to some sensitive sites, in order to prevent man-in-the-middle attacks. This behavior can be triggered either by the websites themselves, by sending the Strict Transport Security header, or configured by users for those websites that don't support Strict Transport Security yet.
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Screenshot of a website blocking the creation of content which matches a regular expression term on its blacklist. In computing, a blacklist, disallowlist, blocklist, or denylist is a basic access control mechanism that allows through all elements (email addresses, users, passwords, URLs, IP addresses, domain names, file hashes, etc.), except those explicitly mentioned.