Invalid Server Certificate - Apps can't access internet

[dsto]

None of my apps can access the internet. When I open the Play Store, Youtube, Facebook, or another internet app, I get a blank screen that says "No Connection" with a "retry" button. When I use the browser, every website I visit brings up several error windows saying "This certificate is not from a trusted authority" (if I "continue" through them all I can still access the web pages). When the phone tries to automatically check my email, it gives me an "Invalid Server Certificate" error. What should I do?

 

[AECRADIO]

To change or edit your security settings for certificates, you need to open this: 'Location & Security'

.
Tap the 'Manage Trusted Certificates' menu to access the list of loaded handlers:

Then you go to the next section of the same menu to here:
And finally: select the appropriate certificate handler/s, or none

And last but not least, you have this final menu window to make adjustments in: 'Tap 'status bar'' to access this.

You can always make the proper filter adjustments if you need filters, or none at all.

These are in the Location & security menu.