In network environments, website access issues frequently trouble users and developers. A common scenario is when a domain’s “blocked” check shows normal, yet the website remains inaccessible. This phenomenon can be caused by various technical factors. Below, we will analyze possible reasons from a professional perspective and provide solutions to help users quickly identify and resolve the issue.

Possible Cause Analysis #

1. DNS Resolution Issues #

The Domain Name System (DNS) is the core mechanism for converting domain names to IP addresses. If DNS resolution is abnormal, even if the domain is not blocked, the website may still be inaccessible. For example, the DNS server might return an incorrect IP address, or the resolution request might be delayed or lost. Users can troubleshoot using the following methods:

In the internet age, a domain name is a core asset for website operation. However, sometimes a domain name may not be accessible in certain regions, a situation known as “domain name blocking.” This can prevent users from accessing the website, affecting business and user experience. This article analyzes the causes and manifestations of domain name blocking from a professional perspective and provides practical solutions to help website managers address such issues.

Whether an app can still function after its domain is blocked depends on the app’s architecture and network request mechanisms. If the app relies on a blocked domain for communication, it may become inaccessible; however, if it uses IP addresses, backup domains, or local HOSTS mappings, it may still work. Below is a detailed analysis:

1. Does the App Rely on the Domain? #

• Scenario 1: App Directly Relies on Blocked Domain
  If the app communicates with the server via a blocked domain (e.g., api.blocked-domain.com) for tasks like data retrieval or user authentication without alternative mechanisms, it may fail in the blocked region, resulting in:

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