How can I resolve cetificate errors which have popped up since 1st January?
One of my computers is giving certificate errors for many popular websites since the beginning of the year. Is there a way to resolve this? Please see screenshot attached.
Chosen solution
Thanks for your response Cor-El.
This finally resolved itself when the computer was upgraded to Windows 10.
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Try to rename the cert8.db file (cert8.db.old) and delete the cert_override.txt file in the Firefox profile folder to remove intermediate certificates and exceptions that Firefox has stored.
If that has helped to solve the problem then you can remove the renamed cert8.db.old file. Otherwise you can rename (or copy) the cert8.db.old file to cert8.db to restore the previously stored intermediate certificates. Firefox will automatically store intermediate certificates when you visit websites that send such a certificate.
You can use this button to go to the current Firefox profile folder:
- Help > Troubleshooting Information > Profile Directory: Show Folder (Linux: Open Directory; Mac: Show in Finder)
- http://kb.mozillazine.org/Profile_folder_-_Firefox
You can check the connection settings.
- Tools > Options > Advanced > Network : Connection > Settings
- https://support.mozilla.org/kb/Options+window+-+Advanced+panel
If you do not need to use a proxy to connect to internet then try to select "No Proxy" if "Use the system proxy settings" or one of the others do not work properly.
See "Firefox connection settings":
Chosen Solution
Thanks for your response Cor-El.
This finally resolved itself when the computer was upgraded to Windows 10.