[▲ Vercel Community](/) · [Categories](/categories) · [Latest](/latest) · [Top](/top) · [Live](/live) [Help](/c/help/9) # Why Vercel custom domains show no-sni.vercel-infra.com SSL certificate mismatch 2 views · 0 likes · 3 posts Ryan K (@ryankaminsky-2890) · 2026-04-13 Hi all, ## Problem When I added my domain (https://www.jobbox.cc) inside Vercel Domain config, Vercel seems to add `64.29.17.1` as an IP as well ([dnschecker.org](https://dnschecker.org/#A/www.jobbox.cc)). On the `64.29.17.1` IP, I’m seeing a `no-sni.vercel-infra.com` error when I run a test on [SSL Labs](https://www.ssllabs.com/ssltest/analyze.html?d=jobbox.cc&clearCache=on). ## What I’ve Tried * I tried removing and re-adding `jobbox.cc` and `www.jobbox.cc`. * Both domains show “OK” when I hit them via browser or `curl`. ## Current Behavior Some users can’t visit the site because of the certificate issue. > **Error: no-sni.vercel-infra.com** Anyone encountered this or know what is going on? Thanks system (@system) · 2026-04-13 The domain troubleshooting guide can help with most custom domain configuration issues. You might be able to use that guide to solve it before a human is available to help you. Then you can come back here and share the answer for [bonus points](https://community.vercel.com/t/introducing-the-vercel-leaderboard/1358). https://vercel.com/docs/projects/domains/troubleshooting You can also use [v0](https://v0.dev/) to narrow down the possibilities. Ryan K (@ryankaminsky-2890) · 2026-04-13 **Additional details:** * Domain: `www.jobbox.cc` * Vercel project: `jadash` * Both domains show "Valid Configuration" in dashboard * DNS resolves to two IPs via CNAME `b75307a8ca13a8ee.vercel-dns-017.com`: `216.198.79.1` and `64.29.17.1` * `curl` tests with SNI pass correctly on all IPs * SSL Labs shows Certificate #2 (No SNI) serving `no-sni.vercel-infra.com` with MISMATCH — serial number `06ea88a51285ec7fd039f147fe24ea020104` * This persisted even after removing and re-adding both domains to force SSL re-provisioning * Real users are getting "Safari can't establish a secure connection" and "Website can't be reached" errors * Certificate #1 (with SNI) shows subject as `jobbox.cc` only — `www.jobbox.cc` not in Alternative Names