UPD: Problem was reproduced for me in Windows 10 EN Enterprise LTSB 64-bit. I install Windows → I download browsers (more I do not download anything after installation) → I get same errors.

1. Problem

For example, I visited https://bower.io/ site. Instead of site content I see Secure Connection Failed:


When I visited a lot of sites, I see Secure Connection Failed. How I can disable it always, for all visited sites?

I detect these problem about half-year — almost at the same time as I bought a mew computer. The vast majority of sites open normally for me, but for some sites I get Secure Connection Failed.

I don't think, that bower.io or another sites banned in Russia — my country.

2. Environment

  1. Windows 10 x32,
  2. Firefox 50.0.1,
  3. I'm not use antiviruses or others anti-malware applications,
  4. I'm disable Windows Firewall and others Windows security tools.
  5. I'm not use proxy.

No proxy

3. Not helped

  1. The problem reproduced for me in Firefox Safe Mode.
  2. I check my computer on viruses, use HerdProtect. I have not malware in my computer.
  3. I can not visited https://bower.io/ via Internet Explorer 11.576.14393.0 and Chrome 55.0.2883.87 m:

Bower Explorer

Bower Chrome 4. I change values for security.ssl3.dhe_rsa_aes_128_sha and security.ssl3.dhe_rsa_aes_256_sha in Firefox configuration.
5. I delete cert8.db file into my profile, but if I run Firefox again, cert8.db was created for me again.
6. I add .eg top-level domain, to bower.io, but that site still not open for me.
7. I update internet time:

Internet time

4. Do not offer

  1. Please, don't tell me, that my computer is more vulnerably, I reduce my security and so on. I understand it, but I do not matter want to disable Secure Connection Failed.
  2. Please, do not offer solutions, how I can set my sites, that no get Secure Connection Failed. I'm not owner of the sites, which I visited.
  3. Please, do not offer solutions, how to disable for each site separately. I don't want wasting my time to add an exception for each site, I want solution for all sites at once.
  4. Please, do not offer to use Browsec VPN or other VPN addons. I use Browsec VPN in my Firefox, and that visited https://bower.io/, I need enable Browsec VPN → visited bower.io → disable Browsec VPN, because, it works slowly. I want to visited bower.io in «normal mode», without proxy or VPN.
  • Did you try to see why the certificates aren't trusted? (No idea how you do that in Firefox though.) Maybe your system or some proxy is compromised already? – Mario Jan 7 '17 at 7:48
  • @Mario, not, I don't understand, how I can do it. I don't use proxy by default and every week I check my computer use HerdProtect. What else should I do? Thanks. – Саша Черных Jan 7 '17 at 8:26
  • If you can open the sites with a proxy or VPN, then it's a Deep Packet Inspection (DPI) or your country has restricted connecting to those sites using port 443 (HTTPS port). – NetwOrchestration Jan 7 '17 at 9:25
  • Your system thinks something is wrong with these certificates, but for everyone else they are OK. That indicates a problem with your system. You should fix that problem, not hide its symptoms. – gronostaj Jan 7 '17 at 9:28
  • Please include translations of browser warnings on screenshots that you've added. – gronostaj Jan 9 '17 at 0:26

The Reasons can be many. I would like to suggest few

  • Check that you are under proxy by navigating to about:preferences#advanced, Open Connection Settings. Example settings preview: Image
  • Check the application that you're running. If you are running from a shortcut then the shortcut could be edited and running a malware app then that app is running firefox with some modified settings. Try running firefox from the {original installed location}/firefox.exe
  • If the shortcut's target url contains different path or contains any arguments to firefox then there's a malware installed in your browser. Check the installed addons/extensions. Uninstall untrusted addons.

Hope this solves your query.

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