This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Avatar for Username

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Este fío arquivouse. Faga unha nova pregunta se precisa axuda.

Untrusted connection on EVERY WEBSITE

meresar
meresar
more options

No matter what website I try to connect to, I get the "This connection is untrusted" error. This happens in private browsing too and I've checked that my computer's internal clock is correct. This happens on any computer I connect to my network. (I've already tried the obvious stuff like rebooting my modem, computer and router.) My ISP says that everything seems fine on their end, but I don't know what else I can fix.

Does anyone know what might help?

No matter what website I try to connect to, I get the "This connection is untrusted" error. This happens in private browsing too and I've checked that my computer's internal clock is correct. This happens on any computer I connect to my network. (I've already tried the obvious stuff like rebooting my modem, computer and router.) My ISP says that everything seems fine on their end, but I don't know what else I can fix. Does anyone know what might help?

All Replies (1)

jscher2000 - Support Volunteer
jscher2000 - Support Volunteer
  • Top 25 Contributor
more options

Could you copy/paste the error text you're getting? In particular, there is an error code usually in parentheses with words separated by underscore characters.

Does the error also occur in other browsers that use the "system" certificate store (e.g., IE and Chrome on Windows, Safari on Mac)?

Does your firewall/router/modem do any kind of filtering of secure sites? In order to do that, the device would need to send a fake certificate to Firefox, otherwise it could not decrypt the communication.