• I've recently installed Debian Stretch from netinst with GNOME desktop.
  • Clicking around on Github soon produces a "Secure Connection Failed. The connection to the server was reset while the page was loading." type error on Firefox 52.8.0 ESR.
  • Upgraded Firefox to 60.0.1, seemed better, but after a while still received the same SCF error.
  • Tried with Chromium, similar experience.
  • Checked the Mozilla help pages, no success.
  • Also, websites like khanacademy and wunderlist browser app are not loading at all, these could be related. Wunderlist is sometimes cycling between waiting for the website and performing a TLS handshake.
  • Also, StackOverflow and SuperUser both notified me of too many requests.
  • Another, possibly related browser experience is that a few days ago I wanted to download a file from a shared sharepoint directory, one of the browsers didn't load after I clicked download (FF), the other interestingly required a login which I didn't have (Chromium). Tried on my Windows computer, the download worked flawlessly, and it didn't ask for a login (I was not logged in to the site, this was a third party sharepoint site).

Based on other threads my leads are TLS, SSL, HTTPS, NPAPI, or some active content management, Flash, Java, etc., but I'm no expert in any of these. I am guessing there are some packages I should have installed but I have no clue which.

The only plugin I use on FF is AdBlock, my hardware is Intel NUC7i5BNH barebone.

Apologies if this question is a duplicate I've yet to find a useful answer. This is the thread I believe is most related: Secure Connection Failed. Can someone please point me in the right direction?

Edit (2018.07.08):

some useful links:

https://cheapsslsecurity.com/blog/troubleshoot-secure-connection-failed-error-firefox/

https://www.techwhoop.com/secure-connection-failed-firefox/#Check_your_Firefox_proxy_setting

https://www.askvg.com/fix-secure-connection-failed-problem-in-mozilla-firefox-web-browser/

  • I have installed FF 61.0.1 (64-bit). The problem remains.
  • FF proxy is set to use system settings (no proxy)
  • about:config security.ssl.enable_ocsp_stapling had been set to true by default, I've set it to false.
  • Browser passed the following tests (https://weblogin.bu.edu/troubleshooting?cmd=ssl): cookies enabled, JavaScript enabled, SSL encryption works, SSL addresses match non-SSL addressed. -> issue is probably not browser related.
  • Checked the SSL certificate of some problematic sites, everything seems to be fine (https://cheapsslsecurity.com/ssltools/ssl-checker.php). -> issue is probably not site related.
  • Various sites claimed there could be an issue with the security software. Tried with a clean install with no antivirus or firewall enabled (to my knowledge) the issue remains. -> issue is probably not antivirus or firewall related.
  • At the moment I am guessing openssl (1.1.0f-3+deb9u2).

Any help would be highly appreciated.

  • Not an answer, but I suspect the login request on Chromium was for the DE password service. I use KDE, and Chrome asks for a kwallet login when started while Firefox does not. I assume Gnome has something similar. If that's the case, it has nothing to do with the secure connection; it just relates to stored passwords for sites and is asked automatically at browser startup. – fixer1234 Jun 19 at 21:58

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