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Thunderbird 78.8.1 certificate problem

  • 5 replies
  • 1 has this problem
  • 15 views
  • Last reply by schellwat

schellwat
schellwat

After restart of Win10 Thunderbird works flawlessly, including subscribing to an ical calendar (kronox.oru.se). But as soon as I start any web browser (Firefox, Chrome or Edge) I get the attached message box, neither "Get Certificate" nor "Confirm Security exception" seem to have an effect. Worse than that (just pressing "Cancel" once in a while would not bother me too much), communicating with email servers using OAuth stops working. Neither closing all browsers or restarting TB helps, only reboot. I tried all fixes I could find, including deleting cert8.db (now probably cert9.db), changing TB settings, but nothing helped. This is very bothering, as after restart I have to decide whether I want to use email or a browser, I cannot have both. Any help highly appreciated, thanks, Holger.#

After restart of Win10 Thunderbird works flawlessly, including subscribing to an ical calendar (kronox.oru.se). But as soon as I start any web browser (Firefox, Chrome or Edge) I get the attached message box, neither "Get Certificate" nor "Confirm Security exception" seem to have an effect. Worse than that (just pressing "Cancel" once in a while would not bother me too much), communicating with email servers using OAuth stops working. Neither closing all browsers or restarting TB helps, only reboot. I tried all fixes I could find, including deleting cert8.db (now probably cert9.db), changing TB settings, but nothing helped. This is very bothering, as after restart I have to decide whether I want to use email or a browser, I cannot have both. Any help highly appreciated, thanks, Holger.#
Attached screenshots

Chosen solution

Wow! This was it. Maybe helpful for other users: "Video Downloader Ultimate" is a browser plugin to download videos. I got it as a bonus when I bought Ahead Nero (disc burning). This app maintains a list of certificates and one of these got in the way with TB. After flushing those, TB works flawlessly. Cool!

Thanks a lot for your help! Now I will donate!

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All Replies (5)

christ1
christ1
  • Top 25 Contributor

Inspect the certificate - see the attached screenshot for instructions.

Who is the issuer of the certificate? Please post a screenshot of the Certificate Viewer window with the issuer information visible.

schellwat
schellwat Question owner

Hi christ1, thanks for the prompt reply. My certificate viewer looks differently or I could not find the proper one. This is what I got, hope this helps. Best regards, Holger.#

christ1
christ1
  • Top 25 Contributor

That's fine. Your cert has been issued by an organization called "Link64 videodownloader_cert". Does that ring a bell? I have no idea who or what kind of organization that might be. It doesn't look like a regular certificate authority.

Thunderbird doesn't know about them, hence you get the exception prompt. If this is legitimate you'd need to obtain the root cert for that organization and import it into Thunderbird as a CA certificate.

schellwat
schellwat Question owner

Well, I reacted about "videodownloader", I did have a video_download_helper, nothing to do with calendar. So I removed that browser plugin. Unfortunately, this did not help. But I observed that my work-computer, on which I do not have this problem, uses a different certificate issuer. So it seems that we have at least a trace of the problem. I will investigate this path. Thank you! I will get back when stuck again or when I solved the problem ;-)

schellwat
schellwat Question owner

Chosen Solution

Wow! This was it. Maybe helpful for other users: "Video Downloader Ultimate" is a browser plugin to download videos. I got it as a bonus when I bought Ahead Nero (disc burning). This app maintains a list of certificates and one of these got in the way with TB. After flushing those, TB works flawlessly. Cool!

Thanks a lot for your help! Now I will donate!