Where did you install Firefox from? Help Mozilla uncover 3rd party websites that offer problematic Firefox installation by taking part in our campaign. There will be swag, and you'll be featured in our blog if you manage to report at least 10 valid reports!

Avatar for Username

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

This thread was archived. Please ask a new question if you need help.

cant access wikipedia.org due to security certificate error SEC_ERROR_UNKNOWN_ISSUER

Flap_Zappa
Flap_Zappa
more options

for the last few days I have not been able to access wikipedia.org due to security certificate error SEC_ERROR_UNKNOWN_ISSUER as wikipedia is a very mainstream site I am surprised they would have this issue. It affects firefox, chrome and MS Edge

for the last few days I have not been able to access wikipedia.org due to security certificate error SEC_ERROR_UNKNOWN_ISSUER as wikipedia is a very mainstream site I am surprised they would have this issue. It affects firefox, chrome and MS Edge
Attached screenshots

All Replies (2)

FredMcD
FredMcD
more options

How to troubleshoot the error code "SEC_ERROR_UNKNOWN_ISSUER" on secure websites https://support.cdn.mozilla.net/media/uploads/images/thumbnails/2017-06-07-08-34-22-cb6da3.png

https://support.mozilla.org/en-US/kb/troubleshoot-SEC_ERROR_UNKNOWN_ISSUER

jscher2000 - Support Volunteer
jscher2000 - Support Volunteer
  • Top 10 Contributor
more options

Since all of your browsers are affected, it may be some external factor such as:

  • security software that filters your web connections
  • "parental control" software that filters your web connections
  • firewall software
  • ISP settings error
  • proxy server settings error
  • private VPN/Hola/TOR settings error