“Secure Connection Failed” Error in Firefox

[Marcelo Laia <marcelolaia@gmail.com>]

Hello Debian users!

When accessing the website https://gontijoonibus.gontijo.com.br/ on Firefox Android (on my smartphone), the site is accessed normally. However, when attempting to access this site on the desktop, Debian Firefox-ESR version 115.8.0esr (64-bit), the following error occurs:


Secure Connection Failed
An error occurred during a connection to gontijoonibus.gontijo.com.br.
The page you are trying to view cannot be displayed because the authenticity of the received data could not be verified.
Please contact the website owners to inform them of this problem.

Learn more…


I have already changed the minimum accepted TLS protocol value from 3 to 1 in about:config, but this did not resolve the issue.

I have also deleted the ~/.mozilla folder and it was recreated, but without success.

How can I solve this problem?

Thank you so much!

--
Marcelo