[▲ Vercel Community](/) · [Categories](/categories) · [Latest](/latest) · [Top](/top) · [Live](/live) [Help](/c/help/9) # Vercel NET::ERR_CERT_COMMON_NAME_INVALID error on custom domains with valid configuration 28 views · 1 like · 3 posts Luma Software AS (@post-3877) · 2026-03-12 Hi Vercel Support, I’m experiencing an SSL certificate error affecting my domains under my Vercel account. Visitors are getting a “Your connection is not private” warning with the error code: > **Error: `NET::ERR_CERT_COMMON_NAME_INVALID`** ## Domains * `dinengros.no` → 307 redirect to `www.dinengros.no` (Valid Configuration) * `www.dinengros.no` → Production (Valid Configuration) ## Steps Taken 1. Clicked “Refresh” on all domains in the Vercel Domains dashboard 2. Waited 15+ minutes for SSL provisioning 3. Verified all domains show “Valid Configuration” in the dashboard, but the SSL error persists in the browser It appears the SSL certificate has not been properly issued or renewed for the custom domains, even though the configuration looks correct on my end.  Luma Software AS (@post-3877) · 2026-03-12 · ♥ 1 Hi, the issue has resolved itself. It turned out to be a DNS caching problem with my Norwegian ISP (Telenor). No action needed from your side. Thank you! Jacob Paris (@jacobparis) · 2026-03-12 Thanks for following up, time fixes most such DNS issues