Why do SSL connection errors occur and how to fix them?

There are many reasons for the occurrence of such errors. The main ones include:

Incorrect date and time on the device (computer, smartphone, tablet, etc.);

Insecure SSL certificate;

Firewall or antivirus blocking the site;

The included experimental Internet Protocol QUIC;

Lack of updates to the operating system;

Using an SSL certificate of obsolete version 3.0;

An “Invalid CSR” error occurred while generating a certificate from the cloud provider’s control panel.

Date and Time Issues

If the date and time are incorrect on the device, an SSL connection error is inevitable, because when checking the certificate, the validity period is checked. Modern browsers can detect such an error on their own and display a message about an incorrectly set date or time.

To fix this error, just set the current time on the device. After that, you need to reload the page or browser.

Invalid SSL Certificate

Sometimes when you go to a site protected by the HTTPS protocol, the error "SSL-certificate of the site is not trustworthy" appears.

One of the reasons for the appearance of such an error, as in the previous case, may be the wrong time. However, there is a second reason - the browser cannot verify the certificate trust chain because the root certificate is missing. To get rid of such an error, you need to download the special GeoTrust Primary Certification Authority package containing root certificates. After downloading, go to the installation.

Lack of operating system updates

Problems with SSL certificates can also occur due to the fact that updates on your operating system have not been installed for a long time. This is especially true for older versions of Windows (7, Vista, XP and earlier). Install the latest updates and check SSL.