Certificate Error, Can't Access Boards

[Speed Force League Unlimited]

It's not that the certificate for CBR is bad, it's that something on your computer is interfering probably Avast itself which is terrible so I'd just ditch it. But barring that try this:
In Avast or AVG security products you can disable the interception of secure connections:

Open the dashboard of your Avast or AVG application.
Go to Menu and click on Settings > Protection > Core Shields.
Scroll down to the Configure shield settings section and click on Web Shield.
Uncheck the box next to Enable HTTPS Scanning and confirm this by clicking OK.
In older versions of the product you'll find the corresponding option when you go to Menu > Settings > Components and click Customize next to Web Shield

It worked. Thanks bud.

I didn't have to press ok, that button is removed.