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Test link: https://self-signed.badssl.com/

So, it says:

Your connection is not private Attackers might be trying to steal your information from self-signed.badssl.com (for example, passwords, messages, or credit cards).

NET::ERR_CERT_INVALID

self-signed.badssl.com normally uses encryption to protect your information. When Opera tried to connect to self-signed.badssl.com this time, the website sent back unusual and incorrect credentials. This may happen when an attacker is trying to pretend to be self-signed.badssl.com, or a Wi-Fi sign-in screen has interrupted the connection. Your information is still secure because Opera stopped the connection before any data was exchanged.

You cannot visit self-signed.badssl.com right now because the website sent scrambled credentials that Opera cannot process. Network errors and attacks are usually temporary, so this page will probably work later.

  • Opera version: Version:92.0.4561.61 (arm64) (the latest)
  • OS: MacOS

Chrome, for instance, works fine, it gets NET::ERR_CERT_AUTHORITY_INVALID error and allows to get in.

So, both browsers block websites with invalid certificate. But Chrome allows to proceed to website but Opera does not.

Question: how to make Opera work in the same way?

This setting opera://flags/?search=cert#unsafely-treat-insecure-origin-as-secure did not help.

By the way, Safari (MacOS) blocks it as well. enter image description here

Kirby
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  • Opera is based on Chromium, so if Chrome, Edge, and Chrome all of the problems, then the problem is with the certificate. You don't mention what version of Opera. Care to provide a little bit more information? [Chromium](https://superuser.com/questions/1495449/how-to-remove-your-connection-is-not-private-in-google-chrome-in-my-developmen/1532843#1532843) make sure the self-signed certificate is imported as a Root CA. – Ramhound Nov 16 '22 at 03:43
  • @Ramhound, Sure, it's the latest one (added), just didn't mention this as everything is updated, pardon. – Kirby Nov 16 '22 at 16:06
  • @Ramhound, the certificate import is a long way but probably could be an option. The question is how to make Opera work in the same manner like Chrome does? – Kirby Nov 16 '22 at 16:11
  • Just downloaded certificate and added it into system certificates list and Opera stopped blocking me. Yes, this is a workaround. And still long way. – Kirby Nov 16 '22 at 16:42
  • It's not a workaround. It's the standard operating procedure if you want to use, a self-signed certificate, that's been the reality for several years now. As I suggested, Opera, based on Chromium, will follow whatever Chromium does (with a small time lapse) – Ramhound Nov 16 '22 at 17:15
  • Got it. So, Chrome and Opera based on Chromium why they have different behavior =) – Kirby Nov 17 '22 at 20:44

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