Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Certifacate issue

  • 3 replies
  • 6 have this problem
  • 1 view
  • Last reply by chaeril

more options

Starting today whenever I try to open google or other website, i got this error : "You must log in to this network before you can access the Internet. This site uses HTTP Strict Transport Security (HSTS) to specify that Firefox only connect to it securely. As a result, it is not possible to add an exception for this certificate."

when i click Advanced, the following message shows : "www.google.com uses an invalid security certificate. The certificate is not trusted because it is self-signed. Error code: MOZILLA_PKIX_ERROR_SELF_SIGNED_CERT" (image attached : image1)

I try this solution : https://support.mozilla.org/en-US/questions/1116116 which is shows something like this (image2)

i try to find program BrowserSafe as the post suggest but there's none. I use windows 7 and this is the first time i experience this problem

Starting today whenever I try to open google or other website, i got this error : "You must log in to this network before you can access the Internet. This site uses HTTP Strict Transport Security (HSTS) to specify that Firefox only connect to it securely. As a result, it is not possible to add an exception for this certificate." when i click Advanced, the following message shows : "www.google.com uses an invalid security certificate. The certificate is not trusted because it is self-signed. Error code: MOZILLA_PKIX_ERROR_SELF_SIGNED_CERT" (image attached : image1) I try this solution : https://support.mozilla.org/en-US/questions/1116116 which is shows something like this (image2) i try to find program BrowserSafe as the post suggest but there's none. I use windows 7 and this is the first time i experience this problem
Attached screenshots

Chosen solution

Problem solved, it because of firmware upgrade from the router. Thanks for answering

Read this answer in context 👍 0

All Replies (3)

more options

Are you in the corporate network? IT departament didn't change anything?

What is happening after clicking "Open network login page"?

Modified by TyDraniu

more options

Yes, I try to asking them about it but they said no change have been made recently.

Right now (suddenly) I can access the web normally but the problem still persist on wifi network.

Whenever I try to open the login page, it pop another window which said "detectportal.firefox.com/success.txt" but only blank (image attached)

more options

Chosen Solution

Problem solved, it because of firmware upgrade from the router. Thanks for answering