Problem with SSL certificate zotero.org using Ubuntu 18.04 after upgrade from 16.04
When I try to open zotero.org page I get an error
Your connection is not secure
The owner of www.zotero.org 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.
Learn more…
Report errors like this to help Mozilla identify and block malicious sites
www.zotero.org uses an invalid security certificate.
The certificate is only valid for *.api.mandae.com.br.
Error code: SSL_ERROR_BAD_CERT_DOMAIN
I have no clue how to solve it. I already reinstalled SSL certificates and removed certX.db files from profile folder of firefox.
Chosen solution
When routers behave strangely, sometimes it is best to unplug them for 30 seconds and then plug them back in to get a (hopefully) clean start.
Or do you use a VPN?
Read this answer in context 👍 1All Replies (6)
There is security software like Avast, Kaspersky, BitDefender and ESET that intercept secure connection certificates and send their own.
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
Websites don't load - troubleshoot and fix error messages
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
Hmm, I don't get that in California.
Does the company Mandaê Servicios de Consultoria em Logística S / A (https://www.mandae.com.br/) have any reason to be involved in your internet connection?
Nope. I live in France and should not have any connection with this company. I have this same error on two computers with Linux and Windows. Can it be connected with configuration of my network, i.e., router ? This starts to be very mysterious.
Modified by mjjank
Chosen Solution
When routers behave strangely, sometimes it is best to unplug them for 30 seconds and then plug them back in to get a (hopefully) clean start.
Or do you use a VPN?
Thanks, rebooting router helped. I'm curious what has caused this problem.
Possibly your service provider information (e.g., DNS servers) got corrupted in the router, but hopefully not by an attacker.