Vercel NET::ERR_CERT_COMMON_NAME_INVALID error on custom domains with valid configuration

Help
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1

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.

Skjermbilde 2026-03-12 092316
Skjermbilde 2026-03-12 092316723×515 14.7 KB

5

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!

1 Like
6

Thanks for following up, time fixes most such DNS issues