There shouldn't be a problem with the zoom.us certificate and I do not think that a certificate problem would cause such a error to appear. I get a certificate issues in April 2022, so that happened almost a year ago.

Can you attach a screenshot?

• https://support.mozilla.org/en-US/kb/how-do-i-create-screenshot-my-problem
• use a compressed image type like PNG or JPG to save the screenshot

You can try these steps in case of issues with webpages:

You can reload webpage(s) and bypass the cache to refresh possibly outdated or corrupted files.

• hold down the Shift key and left-click the Reload button
• press "Ctrl + F5" or press "Ctrl + Shift + R" (Windows,Linux)
• press "Command + Shift + R" (Mac)

Clear the Cache and remove the Cookies for websites that cause problems via the "3-bar" Firefox menu button (Settings).

"Remove the Cookies" for websites that cause problems:

• Settings -> Privacy & Security
  Cookies and Site Data: "Manage Data"

"Clear the Cache":

• Settings -> Privacy & Security
  Cookies and Site Data -> Clear Data -> [X] Cached Web Content -> Clear

• https://support.mozilla.org/en-US/kb/clear-cookies-and-site-data-firefox
• https://support.mozilla.org/en-US/kb/how-clear-firefox-cache

Start Firefox in Troubleshoot Mode to check if one of the extensions ("3-bar" menu button or Tools -> Add-ons -> Extensions) or if hardware acceleration or if userChrome.css/userContent.css is causing the problem.

• switch to the Default System theme: "3-bar" menu button or Tools -> Add-ons -> Themes
• do NOT click the "Refresh Firefox" button on the Troubleshoot Mode start window

• https://support.mozilla.org/en-US/kb/diagnose-firefox-issues-using-troubleshoot-mode
• https://support.mozilla.org/en-US/kb/troubleshoot-extensions-themes-to-fix-problems

• https://support.mozilla.org/en-US/kb/enhanced-tracking-protection-firefox-desktop
• https://support.mozilla.org/en-US/kb/smartblock-enhanced-tracking-protection
• https://support.mozilla.org/en-US/kb/trackers-and-scripts-firefox-blocks-enhanced-track

Hi Cor-el, Thank you for your quick response.

I was using Zoom, several times, in the week before Mar 31, 2023 without problems.

On Sunday, Apr 2, 2023, I was blocked by this explanation accompanied the Error Codes "Error code: 6" and/or "Error code: 100068000".

The Certificate Viewer, in my attachment, shows effectively the same information as your image except for the validity date.

I agree that there should not be a certificate problem but there is one. How did you solve yours? Did you modify trusted certificates somehow? Through FireFox or Zoom?

I suppose I am assuming that the unsecured connection is a result of this lack of trust, but how does one get it trusted when it is the new one?

I have found 3 other people, in the past week, with the same problem, but there is no responses to their questions that I can find yet.

I thought that clearing caches and cookies for zoom, installing the Firefox 112.0 from April 11, 2023 and uninstalling and reinstalling the newest version of the Zoom.exe client should have fixed it. Once again, the "should" doesn't fix it.

I am very appreciative of any help you might be able to give but sometimes "I just don't know" is the only answer unfortunately. Zoom seems to have precipitated this problem and they are not communicating, yet.

Could be a problem with the intermediate DigiCert certificate stored in the Certificate Manager and in cert9.db in the Firefox profile folder. You can check the Authorities tab in the Certificate Manager to see if you can locate this certificate labeled as "Software Security Device" and remove it. Current release automatically load their own list of intermediate certificates, so there is no longer a need to store them.

Try to rename the cert9.db file (cert9OLD.db) and remove a possible previously used cert8.db file in the Firefox profile folder with Firefox closed to remove intermediate certificates and exceptions that Firefox has cached.

• https://support.mozilla.org/en-US/kb/what-does-your-connection-is-not-secure-mean

You can use the button on the "Help -> More Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page (Root directory).

• Help -> More Troubleshooting Information -> Profile Folder/Directory:
  Windows: Open Folder; Linux: Open Directory; Mac: Show in Finder
• https://support.mozilla.org/en-US/kb/profiles-where-firefox-stores-user-data

Hi Cor-el!

I reached out to Digicert and a very helpful tech discovered that the certificates needed were not provided to clients by Zoom when they renewed - At least, not provided properly to Win7 users ( I guess I am getting to old ...)

There is a trusted intermediate certificate and a trusted root certificate that both have to be imported using MMC. He walked me through it quite clearly, too.

This does not appear to be anything wrong with FireFox (I really didn't believe that anyway)

Thanks for trying to help me anyway ... Dave