Ping Fails but the Website Works: ICMP, TCP and Domain Checks
Learn what ICMP replies, TCP connections and named-domain checks establish, and build useful evidence without treating Ping as a website health verdict.
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Browse all WeaveBit product updates, API guides, and network detection articles in English and Chinese.
Ping 不通不等于网站不可用：ICMP、TCP 与域名检测的区别
了解 ICMP 回应、指定端口 TCP 连接与域名协议检查分别能说明什么，避免把 Ping 结果直接当成网站可用性结论。
Read articleDifferent DNS Answers in China: CDN Routing, Caches and Access Problems
Different IP addresses are a clue, not a diagnosis. Understand routing and TTL limits, preserve the baseline and choose the appropriate access checks.
Read articleDNS Resolves but HTTPS Fails in China: TLS, SNI and Connection Resets
Separate DNS resolution, HTTP Host, TLS SNI, certificate and application failures, then collect reproducible evidence without overstating resets or IP tests.
Read articleDNS 正常但 HTTPS 打不开：TLS、SNI 与连接重置排查
区分 DNS 解析、HTTP Host、TLS SNI、证书与业务问题，理解 IP 测试和连接重置的边界，并按清单收集可复查证据。
Read articleWebsite Works on China Telecom but Not China Mobile: A Troubleshooting Guide
Compare the same hostname, ports and time window across relevant networks, then combine node observations with user evidence and service logs.
Read article用 WeaveBit API 批量检测 DNS 污染与中国大陆域名可达性
按实际 API 契约完成 DNS 与 GFW 两种批量工作流：预估、创建、幂等重试、查询分页与结果保存，并提供可复制的 Python 示例。
Read articleBulk DNS and GFW Checks with the WeaveBit API
Implement two API v2 workflows with cost estimates, idempotent creation, paginated result collection and retention, using a copyable Python example.
Read articleGFW Full Guide: Check DNS Poisoning, HTTP Host and TLS SNI
Prepare domain targets, select relevant mainland China nodes and inspect DNS poisoning, HTTP Host and TLS SNI results before following up on an abnormal outcome.
Read articleGFW 全量检测指南：一次检查 DNS 污染、HTTP Host 与 TLS SNI
从域名清单和节点选择开始，使用 DNS 污染、HTTP Host、TLS SNI 三个维度及汇总定位异常，并保留复查证据。
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