Fixing Vercel DNS Pollution for Chinese Users: A Step‑by‑Step Guide
This guide explains why Vercel‑deployed static sites become inaccessible in mainland China due to DNS pollution, shows how to test the issue, and provides a simple CNAME reconfiguration using cname‑china.vercel‑dns.com to restore access.
Our Chrome extension’s website, hosted as a static site on Vercel, was reported as unreachable for users in mainland China. The site itself was still online, but DNS pollution caused the domain to be blocked.
Users can temporarily resolve the issue by manually setting their DNS server to 8.8.8.8, which bypasses the polluted records.
Original Configuration
After deploying the static site on Vercel, an automatic domain is assigned. In the DNS settings we added a www record with a CNAME pointing to that auto‑assigned domain. This configuration works globally but fails for Chinese mainland users.
Optimized Configuration
According to Vercel’s documentation, the fix is to change the CNAME target from the auto‑assigned domain to cname-china.vercel-dns.com. This directs DNS queries to a server that is not polluted in China.
After updating the CNAME, wait for propagation and re‑run the DNS pollution check.
The check now shows no pollution, confirming that the site is accessible from mainland China.
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Programmer DD
A tinkering programmer and author of "Spring Cloud Microservices in Action"
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