Intermittent HTTPS Error – NET::ERR_CERT_AUTHORITY_INVALID

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1

Hi Vercel team,

I’m experiencing an intermittent issue with my website https://www.baumannzone.dev, hosted on Vercel. I’m occasionally getting a NET::ERR_CERT_AUTHORITY_INVALID error in Chrome (see attached screenshot).
This has happened few times in the past two weeks and has also been reported by some colleagues. Not counting this time, it has never happened to me before

I haven’t changed anything in my deployment, domain, or DNS settings. Sometimes the site works fine, but other times this SSL-related error appears randomly.

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Expected behavior:

The site should load normally with a valid HTTPS connection, without any certificate warnings.

Actual behavior:

Chrome blocks the site with a “Your connection is not private” error, citing an invalid certificate authority. It suggests that the website sent “unusual and incorrect credentials.”

Additional information:

  • Domain: baumannzone.dev
  • Hosting: Vercel
  • Framework: Astro
  • No recent changes to the project or configuration

Can you help me understand:

  1. Why this might be happening intermittently?
  2. If there’s any issue with the SSL certificate provisioning on your end?
  3. What steps I can take to prevent this from happening again?

Thanks in advance for your help. Let me know if you need any further details from my side.

Kind regards,
Baumann

2

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.

You can also use v0 to narrow down the possibilities.

3

Hello,

When this happens error happeb, can you run this script and share us the output: GitHub - vercel-support/vercel-connect-debug: A one line script to help debug connection issues to Vercel hosting ?

Are you on corporate VPN or something? Do you have any browser extension or Antivirus software which probably causing problem?

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4

We are also seeing the same issue with many of our domains

No DNS changes recently, no VPN

Issue has been reported by several different users

5

I will run the script if that happens again and then I ll share the result.

ATM I have an adblocker extension and the dark reader extension as well.

No VPM neither.

6

Hi @joshfradley,

Can you share the output of this script? GitHub - vercel-support/vercel-connect-debug: A one line script to help debug connection issues to Vercel hosting

@baumannzone Acknowledged, we will wait to hear back from you.

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7

ill put this here in case in helps anyone else out:

Hey

Thanks for contacting Vercel support. We’re sorry to read that you’re experiencing difficulties.

Our IPs 66.33.60.129 and 76.76.21.142 are currently being blocked by AS3352 TELEFONICA DE ESPAÑA S.A.U

Our IP reputation team is reaching out to the ISP directly to request that they remove the block.

If this is not successful we will consider removing the affected IPs from our CNAME IP pool to reduce the effect of this on users.

We will provide any update on this case as a reply as soon as we receive it on our end.

Please get in touch if you have any further questions or issues by replying to this e-mail or ticket.

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8

Ah yes, it’s blocked by Telefonica during La liga unfortunately.

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9

Closing this discussion so we can keep the conversation in a single thread.

If you have any more concerns, please share them here:

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