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!

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

I cannot open Paypal at all. I do all of my business and work through Paypal and now I cannot access it at all. It says: Your connection is not secure The o

more options

I do all of my business and work through Paypal and now I cannot access it at all. It says: The owner of www.paypal.com has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website.

This site uses HTTP Strict Transport Security (HSTS) to specify that Firefox may only connect to it securely. As a result, it is not possible to add an exception for this certificate.

What can I do to rectify this situation immediately?

I do all of my business and work through Paypal and now I cannot access it at all. It says: The owner of www.paypal.com has configured their website improperly. To protect your information from being stolen, Firefox has not connected to this website. This site uses HTTP Strict Transport Security (HSTS) to specify that Firefox may only connect to it securely. As a result, it is not possible to add an exception for this certificate. What can I do to rectify this situation immediately?

All Replies (4)

more options

There is security software like Avast, Kaspersky, BitDefender and ESET that intercept secure connections and send their own certificate.

https://support.mozilla.org/en-US/kb/firefox-cant-load-websites-other-browsers-can

https://support.mozilla.org/en-US/kb/firefox-and-other-browsers-cant-load-websites

https://support.mozilla.org/en-US/kb/secure-connection-failed-error-message

https://support.mozilla.org/en-US/kb/connection-untrusted-error-message

http://kb.mozillazine.org/Error_loading_websites


  • uses an invalid security certificate SSL_ERROR_BAD_CERT_DOMAIN
  • configured their website improperly

How to troubleshoot the error code "SEC_ERROR_UNKNOWN_ISSUER" on secure websites https://support.mozilla.org/en-US/kb/troubleshoot-SEC_ERROR_UNKNOWN_ISSUER

more options

I don't understand what you are posting. What am I supposed to do? I read all of that on how to troubleshoot but do not understand the steps or there are no steps to rectify it. What are the steps?

more options

This should work. I used to have the same problem a few months ago but I fixed it. https://support.mozilla.org/en-US/kb/configure-firewalls-so-firefox-can-access-internet

more options

chelev123 said

I don't understand what you are posting. What am I supposed to do?

First thing to do is to figure out which Security Suite you are using, then figure out how to get that application to accept the security certificate that the website uses.

Or contact support for that Security Suite to find out how to stop that application from overriding that feature inside Firefox.