Why can't I access the Web Telegram website (error NET::ERR_CERT_AUTHORITY_INVALID)?

[atinderoffi]

Whether I use Firefox or Chrome, I'm not able to access the https://web.telegram.org/ website. I get the following on Chrome:

Your connection is not private Attackers might be trying to steal your information from web.telegram.org (for example, passwords, messages, or credit cards). Learn more NET::ERR_CERT_AUTHORITY_INVALID Subject: web.telegram.org

Issuer: Cisco Umbrella Secondary SubCA fra-SG

Expires on: Nov 27, 2023

Current date: Nov 25, 2023 And on Firefox:

Warning: Potential Security Risk Ahead

Firefox detected a potential security threat and did not continue to web.telegram.org. If you visit this site, attackers could try to steal information like your passwords, emails, or credit card details.

What can you do about it?

The issue is most likely with the web site, and there is nothing you can do to resolve it.

If you are on a corporate network or using anti-virus software, you can reach out to the support teams for assistance. You can also notify the web site’s administrator about the problem.

I have fully updated (just completed update/upgrade, which I do every day or so) and restarted my PC. I've also noticed for that the last few days that I can't access https://rauias.com, https://www.amazon.in/, https://byjus.com/ and many more getting the same security warnings.

[ProfesorItalo · Accepted solution]

Hello.

The error code NET::ERR_CERT_AUTHORITY_INVALID means that a browser can't recognize a website's certificate or certificate authority (CA). This error can occur for a number of reasons, including:

Using a self-signed SSL certificate
An expired SSL
An outdated browser or operating system
The error message is displayed to protect the user's privacy and prevent potential security risks.

Here are some things that can be tried to fix the error:

Reload the page
Open in Incognito/Private Mode
Clear the browser's cache and cookies
Disable browser extensions
Disable the VPN
Disable firewall or antivirus
Change the network
Run an SSL Server Test
Get a certificate from a valid authority
Renew the SSL certificate

SSL encryption is essential for all websites.