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I am getting connection untrusted error messages for LinkedIn, Yahoo, Mozilla and a few other sites

  • 6 replies
  • 30 have this problem
  • 2 views
  • Last reply by AliceWyman

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I just refreshed firefox and am now getting the "this is an untrusted connection" error message for sites like Yahoo, LinkedIn, Mozilla and a few other banking sites. I have read all of the articles and cannot seem to figure out what is wrong. Any help is greatly appreciated.

I just refreshed firefox and am now getting the "this is an untrusted connection" error message for sites like Yahoo, LinkedIn, Mozilla and a few other banking sites. I have read all of the articles and cannot seem to figure out what is wrong. Any help is greatly appreciated.
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Chosen solution

Found the problem. It has to do with Avast web shield.

Thanks for your help

Read this answer in context 👍 1

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One additional bit of information. I have multiple users set up on my mac and I am not getting the same errors with firefox when logged in under the other users - only my profile.

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Clear the cache and remove cookies only from websites that cause problems.

"Clear the Cache":

  • Firefox > Preferences > Advanced > Network > Cached Web Content: "Clear Now"

"Remove Cookies" from sites causing problems:

  • Firefox > Preferences > Privacy > "Use custom settings for history" > Cookies: "Show Cookies"

You can retrieve the certificate and check details like who issued certificates and expiration dates of certificates.

  • Click the link at the bottom of the error page: "I Understand the Risks"
  • Let Firefox retrieve the certificate: "Add Exception" -> "Get Certificate"
  • Click the "View" button and inspect the certificate and check who is the issuer.

You can see more details like the intermediate certificates that are used in the Details tab.


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Unfortunately none of those suggestions worked.

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Chosen Solution

Found the problem. It has to do with Avast web shield.

Thanks for your help

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Thanks for reporting that the problem was due to Avast web shield. I'll mark your question solved.

For others having this issue I found the following:

https://www.reddit.com/r/avast/comments/2t7n4k/untrusted_connections_after_updating_avast/


If you're getting an "untrusted connection" warning from Firefox when visiting Google and Youtube after recently updating Avast (or if you now can't log into reddit):

open Avast
Settings
Active Protection
Web Shield > Customize
untick Enable HTTPS scanning

Restart Firefox and the problem should be fixed.


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P.S. For more information about Avast and HTTPS scanning, contact Avast support or see: https://forum.avast.com/index.php?topic=159346.0 Topic: Issues and questions on HTTPS Scanning - Avast Internet 2015