June 28, 2025Domain name pollution (DNS Pollution) occurs when the Domain Name System (DNS) resolution process returns incorrect or malicious IP addresses, causing users to fail to access the target website or be redirected to malicious sites. This issue is more common in certain regions and may result from network censorship, malicious attacks, or configuration errors. Domain name pollution not only affects user experience but also poses risks like data leaks or security threats. This article explores the causes, symptoms, and solutions for domain name pollution, providing users with professional and practical approaches.
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June 23, 2025 In the internet environment, domain blocking is a common phenomenon, typically manifesting as users in certain regions being unable to access specific websites through conventional means. However, sometimes a blocked domain may suddenly become accessible again, a phenomenon that may involve various technical and non-technical factors. This article explores the possible reasons for a blocked domain becoming accessible again from a professional perspective and analyzes the mechanisms behind it.
Mechanisms of Domain Blocking
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Domain blocking is typically achieved through interventions at the Domain Name System (DNS) level. When a user attempts to access a domain, the DNS server may return an incorrect IP address, time out, or refuse to resolve, preventing the user from reaching the target website. Such interventions may be implemented by Internet Service Providers (ISPs) or other network management entities to restrict access to specific content. For example, ISPs in certain regions may configure firewall rules to block requests to specific IP addresses or domains.
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