Untrusted certificate with Internet Explorer 11

Question

I get "untrusted certificate" errors when opening all https sites in IE 11.

I added sites to trusted sites, adjusted date and time, reset IE setting, installed sites' certificates (by click on view certificates and then install) but the problem still exists!

When I open up IE and want to open a site IE always shows "There is a problem with this website’s security certificate" after clicking "continue to the website .." always a red error appears on address bar like the following image:

How do I resolve this?

Solution 1

I guess you are in a corporate environment where the proxy acts as SSL in the middle. Connections from the client to the proxy are encrypted, albeit with a proxy SSL certificate. And connections from the proxy to the target site are encrypted with the target's site certificate.

The advantage is that your proxy can perform anti-virus scans and check the content for malicious code.

You sometimes see this happening in third-party firewall solutions on clients, where the third-party software will act like a corporate proxy.

No protection without loss of privacy.

Solution 2

This is probably some legal or illegal man in the middle attack against your computer. Legal SSL interceptions are typically done in company networks or by Antivirus products. But also adware like Superfish or other malware will do such attacks or it might be that your router is compromised.

Comments

[Sarah]

Thanks Samuel, I disabled antivirus and firewall but problem still persists.

[Sarah]

Thanks Steffen, error persists even by disabling Antivirus and firewall. I don't have problem with Firefox browser so I think it's not related to Antivirus or firewall.

[Sarah]

I imported certificate to both trusted root certificate and trusted publisher on local computer (through mmc command), but error still exists.