Cannot connect to site with TLS/SSL

What is the domain name?

frobots.io

Have you searched for an answer?

yes

When you tested your domain using the [Cloudflare Diagnostic Center], what were the results?

works fine

Describe the issue you are having:

cannot establish secure connection to server. BUT only from ONE client. Other clients work fine.

What error message or number are you receiving?

PRN_CONNECTION_RESET or something like that.

What steps have you taken to resolve the issue?

  1. cleared caches of all affected browsers.
  2. added extra DNS entries to route frobots.io to www.frobots.io
  3. deleted my personal certs on my macos and rebooted.
  4. incognito
  5. turned off all extensions and plugins

Was the site working with SSL prior to adding it to Cloudflare?

no

What are the steps to reproduce the error:

  1. only reproduceable on MY computer. So it must be IP related, and it is Cloudflare that is disconnecting, as the origin server is never hit

Have you tried from another browser and/or incognito mode?

Yes, no effect.
Firefox and chrome are broken.
safari seems to work, but only if I enter "www.frobots.io"

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